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A 350 Chevy small block w flat tops punched 30 over is a what?

A 350 Chevy small block with flat-top pistons punched .030" overbore is still fundamentally a 350 cubic inch engine, but with a slightly larger displacement. The .030" overbore increases the displacement only slightly. It won't be a significantly larger number, perhaps in the 355-358 cubic inch range depending on the exact piston and cylinder specs. You'd need to calculate the precise displacement using the formula that takes into account the bore, stroke, and number of cylinders.