Maybe look into Bullet/Ultradyne.
Tim Goolsby recommended the following spec'd cam (hydraulic flat tappet cam (221 intake/230 exhaust @ 0.50″ with .454 lift intake/exhaust & 112 LSA) that conservatively produced 403/482 on my 30 over 400.
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1970 GTO (Granada Gold) - 400 / TH400
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