a can you swap a 99gtz(6g72) with a 6g74 or a 6g75 plz help

yes yu can

does it have the same moter mounts
i whant the 6g75 3.8
but people are saying i cant do it

Well unlike the 6G72 and 6G74 , the 6G75 is a farther departure frum the rest of the earlier 6G7 engine series altho its base mechanical makeup is the same as the earlier series models . The cylinder heads are a rapid departure frum the earlier models, not including that they all employ MIVEC. Unlike the earlier models yu can not swap and play nor plug and play. Yu will need the complete wiring , also the model specific Immobilizer unless yu are really electrical crafty to create a bypass that will send referance voltage to the ECM to fool it as the immobilizer unit.

Well their is a whole list of things that will make the 6G75 not a direct "shoe in"

ya well then ill just go with the bored and stroked 6g74 and tt that bitch