EDITED: after further studying, I have found out that I have posted this wrong.  The Evo 1-3 engines are good swaps for the GST/GSX not the 420a.  Instead, the Evo 4-8 engines will be a better candidate to look at when thinking about swapping.  Sorry for the confusion.

so here are some available engine swaps:

evo 4-8 - it has far superior internals than the 1G.  the weight of the pistons(forged) are ultra light compared to the 1G and 2G but have a higher compression.  it also has 510 injectors and a evo 16G turbo. bigger throttle body.  comes with a titanium valve cover.  but its also expensive

4G63t(aka GST/GSX engine) - dont even think about it unless you are looking to spend a ton of money for the swap.  dont believe me....here is a list of the parts you will need:
1. 4G63 turbo engine (stock) $1500
2. transmission (stock GS-T FWD) $500
3. wiring harness for engine $300
4. 4G63 ECU (stock) $300
5. shift linkage $200
6. custom engine mounts $200
7. chassis cross member $100
8. complete exhaust $200
9. intercooler, turbo, related parts $500
10. boost gauge/fuel filter, etc $300
11. Installation $1500"

Stick with the 420a and build the bottom end first.  You will spend way too much money trying to do an engine swap.  The 420a has plenty of aftermarket parts to enable you to lay down some serious HP.  I would recommend you to research and ask plenty of questions.  I am building my 420a and decided to do so after researching the swap.  Some say that the swap is impossible but nothing is impossible as long as you have the $$ to do the talking.  I am currently building the bottom end with JE .20 overbore pistons and eagle rods, I am going to leave the tranny alone as I discovered it will be able to handle the torture of forced induction.  I will however, change out the flywheel and clutch.  I plan to port and polish the head and change out its components to probably HKS cams and cam gears or AEM cams and cam gears.  Stick with a stage 1 cam gear if you plan to use it as a daily driver otherwise use a stage 2 or greater.  If you plan to put in more than 500 HP, change out the axles as well...I would recommend axis yellow boots as they will handle this power.  I got all this information from someone who already completed this project and was very sucessful.  I can send you more info on all the other details.  email me at maurizio368@yahoo.com

heres my .02 , The only way a 420a - 4G63 swap is any way reasonable, Buy a GS-T front clip.. that should have everything you need. for outher engine swap ideas with the 420a, its good to know some background on the 420a. The 420a is a Chrysler engine aka dodge, plymoth, and eagle ( any bells ringing? plymoth and eagle are chrysler branches,(laser-talon) the GS, RS,and ESI are basicly a mix of mitsubishi and chrysler). the late 90's dodge neon, avenger, and some outher chrysler cars from the late 90's also use the 420a. and some miny vans have engines like the 420a . you may be thinking.. why would I want a miny van engine??!! first off.. for the stronger block, and also the bottom end of the Neon SRT-4 would make a good swap ( but they kind of suck with the a low max rpm) with alot of moding but still easyer than the 4g63. The 420a eclipses/talons/& lasers are set up for chrysler engens. So stop looking at Mitsubishi engines and start looking in to MOPAR engines. As much as this may hurt.. you dont drive a true Rice Grinder! lol . and for those who want to build there 420a heres some links you might like.

engen rebuild 420a  http://www.2gnt.com/www/corbin/rebuild.html

420 dream sight  http://www.geocities.com/vttalon/install.html

HAHN turbo kit  http://www.hahnracecraft.com/auto/eclipse/eclipse.htm

eclipse SSC http://www.eclipsecollectionclub.com/?dire...orms&pagina=mod

Hope this helps

alright your saying it will cost a but load but WHAT IF you are able to get ahold of a 96 gst for cheap since it was wrecked in the rear and all engine components are usable??? would it be worth it at all????

and as for a but load what are you saying estamated????

the engine is not whats so expensive.  its the labor and modifications that need to be made.

price ~$7-8k

Well i did some looking into this, read on lots of random sites that overall it's a bad idea.  The conclusion i really come to is that you could KEEP your GS or RS and buy a GS-T for the price of the swap.

look before you even attempt to do this you should know that the amount of man hours it took is well uncountable if thats even a word...and if you dont have access to a garage with lifts or atleast some jacks and an engine hoist your screwed...its not as easy as the write up seems and im sure i left some things out so dont treat it as a bible...some things will call for a little ingenuity and a lot of patiences...and a final thought if you've never worked on cars before, no scratch that if you've never done more then change your oil and put an intake on dont try this cuz your gonna **** your ride up and your gonna ask me a lot of questions that i dont wanna answer

that being said, cody asked and now you all will recieve my write up on how i did a 1g 1.8 to a 2.0 turbo swap

 turbo_swap_write_up.doc ( 30k ) Number of downloads: 203

that engine will brake your car.

The 6G72 is a 3.0 V6 engine which I believe is shared with Chrysler like the 420A. I may be wrong about that.
How will it break it if I reinforce the right spots. I've seen small-blocks put into '76 Beetles and win a drag. Anything is possible. Crazy, yes, but possible. It would be time and money, but I can work with that.

hi everybody. i know i just joined the community but i know the 6g72 comes in the mitsu 3000gt as a n/t and as a twin turbo i looked this up a while bak but wasnt really sure of the outcome so i called jazzproparts and asked them if this particular motor would fit he said not in an eclipse being a bigger engine. heres a pic of a twin turbo (left) and a n/t  (right)  . good luck if its possible let us know i wanted to try this but never research it  :thumbsup:  :thumbsup:

well, if you orient it in reverse and cut out the fire wall it would probably fit, but like terd said, lots a fabbing. and 6G72 is mitsu made, not chrysler.

So an update is that I will not make this happen any time soon. I don't have the time right now since I'm moving to Florida soon, but I hope to get a job in a custom shop to help out the progress. One day this will be done.....just cause. And I'll take pictures. But keep the replies comin. The more info and opinions the better. I like reading what everyone thinks about it. :liebe011: :thumbsup:

okay guys here we go i found this site that may answer question for the engine swap topic that we being having its called exileracing.com there are some pics of wat looks like a talon if mitsu shares the 420a with some of the chrisler models this people are doing the swap would not hurt to check them out see wat they come up with here are some pics of the car. opinions wat you guys think. not sure of the engine could be a 3rd gen v6 correct me if i'm wrong

ok that was simple.  does the evo tranny bolt up to the gsx motor and awd system?  or are the gears interchangable?

what would it take to get a 2g 2.0 motor into a 1g 1.8 car? and is there anyway possible that it would bolt up to my stock 1.8 tranny?