Help me with some math Please

CCd my heads, assuming I get the second head back and its like the first ( Im sure it will be now ) Ive got one chamber that reads 84 next 86 next 86 and last 84 so I average 85 CC.

If I remember right I have to take into account 440 head gasket thickness ( do you know what that is...standard head gasket bought from Napa unless Im told otherwise )

Also standard cylinder bore, Ive got an ultra low mileage 440 with a bore size of right around 4.325.

I want the engine to have 10.1 compression. Can someone help me with the math/explain to me how to figure out what piston I need to get.

Thanks
Most composite gaskets aren't less than .030" compressed, felpros usually are .039"-.042" compressed, OE embossed shim gaskets are .017". For reference, I put an OE set
of open chamber 10:1 slugs in a '76 440 w/452 heads, all untouched & stock. It cc'd at 9.98:1 w/shim gaskets, so.........