The donor motor that came with my car is from a '90 and there are differences, so what I'm needing to know is, what changed need to be made to make the newer motor work in my older car?

here everythiing you need to know

http://www.rotaryresurrection.com/2ndgen/t...to_s4_swap.html

Thanks! I do, however, have some work ahead of me, since both motors were apart at the time of purchase, I have no idea what parts are what!

Be sure to download a copy of the Factory Service Manual, it will make the job much easyer.

Cool, I will, thanks for the info!

You can download them here:

http://www.rotaryheads.com/PDF/