I stand corrected, Mr Big and I have the same exact program and his calculation is dead on. 10.64:1.
Anyway your quench is perfect at .035" so don't get any closer! The piston would be you best bet to make things right. I know money doesn't grow on trees but we just did a 455 with Edelbrock heads and they flow as good as any Stage 1 SE T/A head and the chambers are 68cc to start. I don't know what kind of power you are looking for but these heads will make over 600HP with 11:1 Compression.