More V8 conversions end up seeing scrap yards/part-outs then ever see the road, so before starting I would reconsider if you really need the V-8. If you just want more power, there are a 200+hp V6(Toyota 3.4 and Chevy 4.3) swaps and 200-400+hp straight 6(Toyota 7mge/gte and 2jzge/gte) swaps that are easier/cheaper to install, lighter, and that are easier on the Toyota drive train. IIRC, one of our members is in the middle of a V8 swap, a search(if you are lucky) might turn up his post.

What are your goals plans w/the truck, i.e., mudding, rock trails, Daily Driver/weekend warrior?
Is this your first Toyota, or 4x4? If this is your first 4x4 you are going a little to fast w/the mods, you want to spend money where you need it, not where others have, or on modifications you don't need.