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Why not figure out your target HP or torque per cubic inch you feel is achievable as a 302 then apply the same math to a 331.

1.2 -1.3 hp per cubic inch is fairly conservative and easy to achieve with aftermarket heads and camshaft naturally aspirated.
 

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This is my 331. Not earth shaking but a good runner with an all the time power delivery. I can't speak to the accuracy as it came with the car.

1057105
 
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