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Here'* my '66 chevelle with a 1970 454 bored .030 over. Rectangular port heads with 2.25" intake and 1.88 exhaust valves. SS hooker headers with holley 800 CFM carb that'* been ported and jetted and the choke plate milled off(by me)for better air flow.
4:11 12 bolt posi rear end with reverse linkage turbo 400 trans. I'll post cam specs later. 4 core aluminum radiator with electric fan and mechanical fan in case the electric fan stops to control the heat. She has about 525+ HP. A similar engine with slightly lower compression dynoed at 534HP.