Yea... 1st gens and 2nd gens are different. The motor sit in opposite directions, for one thing.
You can't throw a 420a in a 1st gen car, but you can put a 1st gen 4g63 into a 2nd gen car. BUT! You cannot put a 2nd gen 4g63 into a 2nd gen non-turbo car.
I know, I added a bit extra, but I...