whats the highest dynamic compression ratio you can have and still run 93 octane gas? I have two choices of pistons one with 30cc dish with a 10.2:1 static CR and a 9.1:1 dynamic CR. the other is a 18cc dish with a static CR of 9.30:1 and a dynamic compression of 8.34:1. I would like to run a bit over 10:1 so my cam has enough compression. the heads are vortecs on a 406sbc the cam is 230/230 camshaft. any thoughts and ideas would be helpful!