Max compression for pump gas iron head

You've been given a lot of "information", but what are the "facts" about your particular combo.

What is your current deck clearance? (OEM engines were all over the place)

What is the current compression height of the piston you are running?

What is the actual measured chamber volume of your heads after the valves have been set? (OEM engines were all over the place, and typically larger than the nominal value).

How "out of square" are your block and heads? .020 is a lot.