With 461 cubes and that small of a cam, with unported stock iron heads, he's probably pretty close to his HP estimate.
It would need quite a bit more camshaft and some cylinder head work to reach closer to the 500 mark.
Maybe with the unported heads, and stepping up to a cam in the 230 @ .050 range close to RAIV spec might get you close to 1hp per CI.
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2019 Pontiac Heaven class winner
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