Hey, I recently bought a 1981 Chevy k30 with as far as I know, an hd350 wondering what the difference was between a regular 350 and an hd350 if you guys know, as well in planning on building a 383 striker and was wondering if I bought the normal parts like the carb, cam, heads would they be interchangeable. I know the crank and pistons and what not would have to be different but I was wondering what I could use in the meantime on my truck.