If you put a V8 in that truck, there's more work than installing an engine. You're looking at transmission and driveline as well as front and rear suspension beef-up.

Also, if you want a driver, you can get a pretty solid motor from GM (Summit, Sallee, Jegs, etc.) for a decent price, complete with carb, distributor, water pump. 330HP, GM PART #12496968 for $3,300 - $3,500. The Edelbrock 320 HP motor goes for almost $5,000.