If you wan't all this "high horsepower" then why start with a 350? Get something like a 454 or a 557 if that is what you wan't. You will have lots of problems if you throw blowers and all that other stuff on a 350 or 383. I know you wanna use the 350 block you have but in a sense it's a waste of money to try and get something like 800 horsepower from it.
My 2 cents!