what engines

89 Z 24, has a 2.8, i know a 3.1 will fit right in, but, is it only to a 93 year that they are the same?
What about later model 3.1's?
Guess i am asking, for each year difference, what are the differences, and can you, and what do you have to do to make a later year work, if it will at all.
Just trying to get car running ok with the newest, best condition 3.1 i can locate, without major mods. Also helps in my search to widen available choices. thanks

If you don't get an answer here, you'll definitely get it at www.v6z24.com