If you can get 800 h.p. out of a 350 that you built in your garage, I'll worship you as a god. I thought the 700 hp 383 was exagerrated. I'd be tickled freakin peachy keen to get 350 out of mine, and I'd be content with 325. I'd say an 800 horse 350 is out of reach for what someone can do in their garage.