I agree with stroking. You'll need it for that kind of hp.

I would say aftermarket heads, stroked to a minimum 426 or larger, SD intake and an 850 Demon or Holley.

make sure your compression is no less than 10:1 too.

the SD intake is short and looks good when painted you can also keep the stock aircleaner.

You'll probable NEED to have headers though which obviously aren't stock.

IMHO it is easier to do this with a stroked 400 and externally they look the same.

I am running 400 with mine and I can probably squeeze another 10 to 20 with easier mods like cam and heads mainly. But I doubt I could see 475 without pulling more CI's.