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I just checked an edelbrock site and it lists the heads you are using as having a 60cc volume. I plugged in 4.030 bore 4 inch stroke .040 gasket thickness 4.030 gasket bore with zero deck height and came out with 13.235 compression ratio. Unless these heads are bigger or your pistons are dished this could be the issue. Of course the deck height will be a few thousands.
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