I want to build a SBC w/a ( 383 ci- I would have to buy ) or a stock bore 400 ( I have now ), w a 350 trans or I can switch to a 700 R4, use reg pump gas in a 1980 GMC 2 w drive truck. I use this truck to pull a slide on camper and a small boat at the same time. What heads to use, cam, pistons C.R., or carb., or I can use a older bolt on the intake Holley adjustable injection system. To get the most HP and torque, and MPG. Any ideas would be great. I can do some of the work my self. I been away from the game too long.