friends motor

Well personally I think those kind of numbers would be more easily attained with better heads. W2s, W5s, large port Commandos, Indys or something along those lines. Ported of course. You'll need about 270 cfm's of flow to support 550 horsepower. But that's not the whole story, the mid lift flow numbers for these heads will out perform the others which will give you a broader and flatter power curve rather than just peak numbers.

Now realistically a stroker would be able to do it easier and be a milder, more civil motor.