I'm rebuilding a 318 bored .030 over and I was wondering which heads would be the best to get a decent compression ratio? My book here says the 302s are the best for compression but I've also read that the ports are rather small unless you do some work to them. What kinds of results has anybody gotten? I was looking at the rebuild kits on summit racing and the pistons they use are 1.759 pin height and +1.5cc piston volume. That adds up to a .063 deck clearance. I used the keith black compression calculator and if I use a 302 head with a .032 thick gasket and the smallest possible chamber cc I end up with a ratio of around 9.6:1. If I want to use a decent cam I would need more than that correct? Probably some milling has to be done?