Years ago I built a 421 bored out to 428 with #62 heads with slightly opened chambers and a mild port job. It used a 1968 intake manifold and the original 1967 GTO carb, headers, HS roller rockers and an UltraDyne cam (sorry don't remember grind but it was not too radical). The car had T400, 3.89 to 1 gears and weighed 3725 lbs with me and a 1/4 tank of gas. It used pump gas and ran consistent very low 12 second quarter miles. Hope this gives you some ideas.
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