how far does 360 piston sit below deck

I pulled a 360 from an 87 van to rebuild for my 73 dart. Those pistons were .13 in the hole PLUS they were dished, LOOOOW compression!!!!
Now they are .05 for all 8 pistons. Now I found out that my compression will be lower than I calculated. In another thread a few guys are saying their magnum heads were cc'd at 64, Ma Mopar advertises 60cc's. My heads were remanned and you can see they were milled, but I used 60 to work out the CR.