This is what I have. 87 Sub with off-road package (dual front shocks, steering stablizer ls rear diff and tow hooks 3.73 gears) 10 bolts f&r, old tired 350, rebuilt 700r4 little rust and recked interior. I want to build a jack of all trades truck(light towing mild off roading DD and family camping trips). I know that means master of none. My plan is to fit 35s-37s with 1" body lift and body mods. Then 2"-4" suspension lift for travel. My questions. The 350 rebuild or replace with a 6.2/6.5 or 4bt. I don't mind the power level the Sub has so better milage with equal power would work. Not sure how the larger tires will affect things though. I want a smoother ride so suspension sugestions... 4 link, soft ride springs??? btw I have 31x10.5 on it now, but I'm putting some 33s (10.5f & 12.5r) next weekend. I would have posted in the Suburban forum but repairs ate my join funds so I have to wait a week or so to post there. Thanx in advance for your sugestions.