cheapest and easyest. 1st gen 4agec (blue top) from 84 to 87 ae86 gts. as far as i know youll need gts wire harness, gts cpu, gts exaust, gts gas tank(for the fuel pump) gts bell housing, isnt totally neccissary but youll have to do some serious heat wrapping cuz the clutch lines will run very close the the exaust. gts fuel lines, gts oil cooler, gts engine mounts, gts clutch assembly. possibly the ignition? theres prob other stuff im missin here, it sounds like a pain in the ass and it is no doubt. but its not all that bad, its well worth the money/labor. it can be done for roughly $450 if im not wrong.