2.5 to 4.3 Vortec swap

I have a '88 S15 with a 2.5 inline 4 and i was thinking bout swapping it with a 4.3 vortec once i get my hands on one. I was wondering what woudl also be neccesary to get such as the computer, motor mounts, etc and i was wondering if the same 5 spd transmission coudl used. thanks