360 flat tops wirh Edelbrock heads

I entered all of the information that the OP gave for calculating his compression ratio and I got 9.87:1. The pistons are .005" down the bore add that to the headgasket thickness gives .041" quench distance, 5cc valve reliefs. Headgasket thickness is .036". Bore is 4.030" headgasket bore diameter I figured at 4.100". 63cc combustion chamber size. Stroke is 3.580".