well looking at pistons for a puller out of the motorhome stronger block i found that 10cc head volume is 1 point to 1.2 points lower or higher. my 440-1 heads are 54cc so a 10 to 1 @ 84cc is around 13 to 1 for me. but pistons are not that much compared to a set of heads with small chambers.
deck the block and deal with intake and push rod issues
running up at numidia i do wish i had more compression in my duster but it would not amount to much i bet going from 13 to 14 or 15 i bet.