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Engine performance

I just recently rebuilt my engine by resleeveing my block, running a standard set of some TRW dish pistons (9 1/2 to 1), reworking the closed chamber heads, a Perfomer Intake, .56 lift (intake and exhaust) with 110 separation reground cam from Scnider here in San Diego and a Holley 750. I took it over to the Dyno to test before installation. After cam brake-in we did several pulls and the best it did was 350 HP @5200 RPM. Is this is good as it gets? Was I expecting to much?

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