With a flat top I'm coming up with 11.8:1 with 4.375x4.15, zero deck, 84ccs and .040 gasket. 80ccs makes it 12.3:1...

Is that the bore and stroke you had in mind Gary?

It would seem like kind of a shame to have low compression when 12:1 is so easy to get with a flat top, but wanting to stick with pump gas is sure understandable.