I'll be boring out my 88' 350 .03 over and therefore installing new pistons and rings. I don't want too high of compression because I want it to run on either 87 or 89 octane gas. I've also got the vortec heads with 64cc combustion cambers. With that in mind, what kind of compression should I shoot for? I've been looking at pistons on Jeg's and Summit and the lowest compression I can find is 9.35:1 with the Federal-Mogul hypereutectic pistons (which seems a little high) and are $21 each. They sell cheaper pistons but the compression for those is just over 10:1. Also, would I be ok just going with pistons from Autozone or O'reilly? I don't drive hard so I don't need some kind of high performace racing piston. -one more thing, When you increase the volume of the combustion chamber such as when you bore out the cylinders, does compression go up or down? I thought it was down but the guy at Jeg's told me otherwise.