It will bolt up. The only thing to look at is if it's a hydro or cable tranny.

As long as you're going with a manual setup, no computer changes are made.

If you do the engine/tranny swap, that's a different story. Being a 91 teg, it's OBD0 computer system. If you go B18B, I think it's OBD1. So you have to choose if you want your car/setup to be OBD1 or OBD0. Fill me in and I can help more.