Not too sure as I am a rookie to this engine in general, but I am guessing with playing with different cam grinds and a slight bump in compression from milling and thinner Cometic gaskets, I believe 580-600 is very possible. Haven't seen too many builds around NA on here other than Tooloe's in person and racing my high 11s low 12s T/A that he could hang with. His wasn't an R&D build but rather a textbook, already proven combo and run through the manifolds as others here I know.
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