Guess The Compression Ratio

Those mopar head gaskets are for a bore of a maximum of 4.060 so I doubt there quite as big as the felrpros wich are 4.180 but still trying to guess the compression is basicly impossible unless the engines apart.My brothers 360 is at 10.75 with std. felpro gasket,kb 107s @ zero deck and .050 milled off the heads-and it behaves like it!-its a pretty nasty small block and is octane sensitive.