Darknight,
You could go with "Fast Burn" heads from GM, 210cc intake ports, Vortec Style.
With a .509/528 lift and 222/230 duration cam @.050 lift made 425HP on a 383 with 9.7:1 compression. Recommended carb was a Demon 750.
Said the heads would support well over 500hp.
Just my.02$.
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1971 Nova, 300hp GM Crate, Hughes Tranny, Corbeaus, Covans
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