Thanks for all the input guys. The original engine is a V8. I think it's commonly referred to as an RPO or something like that. I may be completely off. Of course the truck won't be original after its chopped, bagged, and blowing black smoke, but I'm not wanting original. I want all the original body and frame. There is tons of 3/4 ton dually framed bagged trucks out there so that wouldn't really turn any heads. I haven't seen many in the "big bolt" format! Haha. That name alone is just cool to me. But thanks again. You guys have been a lot of help.
