1st ? is prolly better for 88slowmarro…as well as the snd too…pm him im sure he will know…not really sure about the 1st ?..i know you can get an indpendent comp as well as a better intake manifold for like 2 gs i think…i belive the only diff betweent the 2wd and the 4wd is just takeing the tailshaft off and putting the tranfercase and shorter tailshaft back on…but im sure 88slowmarro will know…i was going to use a turbo 350 4wd and take off the transfercase and put a long tailshaft on but i found a 2wd turbo 350 that wud work and was a lot less haslle…but then again idk about the 4l60e