A bit of Googling or a search on this Site should answer your questions.
Basically you want engine, trans, tailshaft (propshaft to some) ECu and body plugs plus interior diagnostic port. The engine should be complete from air cleaner to 02 sensors and have all ancilliaries.
Funny. Ive done hundreds of 2wd hilux pickups now and only done rear disc brake conversions on a couple. Front brakes heaps but not on all. I just did a video which is proving popular on youtube. Search CartuneNZ cheers