Cody, I have a 3rd generation (88-91) prelude as well. The only 2 engines that you can put in it are a H22- with special motor mounts along with custom axles and everything, or a B20A5 or B21 motor. You can put the JDM B20A motor in your friends car as a drop in replacement for the stock engine. They only cost about 600-700 bucks. Other than those 2 engines, without MAJOR custom fabrication and wiring, no other engines can go into his prelude. Tell your friend to check out preludepower.com they have a ton of info on prelude engine swaps.