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Head Milling.

I have a 1972 351C. Cam is 536 lift. Closed chamber 2 bbl. 2.19 Valves. Flat top pistons. I`m told Compression is anywhere between 9.7 to 10.5. I`n any case, That`s High test Territory. The Engine is 30 over. It sucks to be Paying for High Test on a Low HP Engine like this. How much more Hp Can I get if I Milled the Heads? I was told if I milled 8 thousandths off, That`s worth a Point of compression. Any Ideas?
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