Stroker Piston, Closed Chamber clearance

OLDSTYLE said
20.5cc dish piston
1008 FelPro gasket (4.18 gasket bore .039 thick)
zero deck
60cc combustion chamber

Equals 10.4:1 compression

whats the difference between a thinner gasket and milling the heads?

If I dont have to mill the intake... I will mill the heads to get the compression I need.