360 compression issues. pick a piston??

Actually, most in depth engine building articles say to choose the camshaft last, but that's something I have never done myself.

That said, to the OP, you have aluminum heads. In order to take full advantage of them you will need a moderately aggressive cam at the very least. Those two things alone say you can stand over 10:1 compression with no trouble.

My God. Deck the block to zero deck with the KB 107 and go with it. You will be fine. A lot of yall are WAY over thinking this.