I won't build a pump gas motor with iron heads that has more than 9.75 to 1 ratio, neither should you
My last pump gas motor that made decent power, 727 HP, had 10.78 to 1 comp ratio with a set of Indy SR M.W . heads and a Indy 400-3 intake with a Holley #9375 non HP Dominator, that baby ran really good