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I don't know all the specific parts you would need, Hot Rod Magazine had an article a couple months ago about Ford's new "super-engine" for the $150,000 GT40 which was a supercharged 5.4L (~330ci) which was supposed to make 500hp. (We won't mention that the pushrod LS1 in the new Corvette Z06 is making 405HP, naturally aspirated, with barely 16 more cubic inches for a MSRP of $52K) I think HRM also had another article on the "Fast-Forward Fastback Mustang" and claimed to squeeze out 500 HP from a 351 (again with a blower) I don't guess there is anything inherently wrong with a 351, but the theme of the day does seem to be forced induction at a power level of 500 hp.