If you decide to go ahead with the V8 conversion, it would probably be a wiser choice to find a big block engine- - - -a 366, 396, 427, or 454 instead of a 350. Small block engines can produce a lot of horsepower, but they do it at RPM ranges that aren't truck-friendly. The big block engines have more low end torque, and the "tall block" 366 and 427 engines were designed for truck use from the beginning.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!