With the mods you listed, none having port work performed to them, I think you'll be looking at power in the 375hp area. Give or take based on that camshaft. If the cam is very well matched to the combo, you can pick up quite a bit when it's finally tuned and properly set up. If you were turning 7000rpms, or you had 11:1 CR you could close in on that 450.
That's just my opinion from lots of similar combos on this board.
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