alright ... i now have answers. Being in the salvage yard business i use the ADP Hollander system that runs off of factory part #'s. engine 's are 90-94, 95, 96. Blocks all interchange 90-96. There is a prod. date split in 94 that makes it one way interchange newer replaces older. Cyl. heads are 90-94, 95-96( bare heads, not loaded). cams on 96 are 96 onlt w/ the intake cams being same as non-turbo and J30. Injectors 92-95 blue and black, 96 by itself. thanx guys