there's a few sites around for USDM vehicles, but as far as i know nothing for the any other market. I searched for a VIN database of the european market and JDM vehicles a while back but couldn't find anything.
http://www.3kgt.org/dbase/http://www.ypass.net/misc/3sinfo/story.phpbut if the GTOs in any way correspond to the VIN list i have, in which MY0000072 is missing, along with many others (i have a hunch thats because it IS a GTO and this list is USDM only), your manufacture date would be the 3rd week in April, 1990.
"...
"MY000069","JA3XD54BXMY000069","3B","Z11A","MRPML7M","EQU","EXT","INT","
90043","91"
"MY000070","JA3XD54B6MY000070","3B","Z11A","MNPML7M","EQU","EXT","INT","
90043","91"
"MY000071","JA3XD54B8MY000071","3B","Z11A","MNXML7M","Z47","EXT","INT","
90043","91"
"MY000082","JA3XE74C0MY000082","VR","Z16A","MNGFL7M","Z37","EXT","INT","
90043","91"
"MY000083","JA3XE74C2MY000083","VR","Z16A","MNGFL7M","Z38","EXT","INT","
90043","91"
"MY000084","JA3XE74C4MY000084","VR","Z16A","MNGFL7M","Z39","EXT","INT","
90043","91"
..."
im assuming that chassis #s 72-81 are GTOs, which is why they are missing from my list. If you ever do manage to track down the rest of the data I would love to have it.
good luck bro...let me know if you find anything.