Cylinder Head CCs and Compression

The 10 cc difference results in about 9/10ths of a point.
You can do the math here:
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Are you sure that you want to be bumping up against 11 to 1 compression? Even with aluminum heads, that is race gas compression. I was at 10.94 to 1, aluminum heads and a big, solid Lifter Lunati 316/326 cam and it still knocked on 100 octane.