KB399s

The idea is not just the compression. The chamber on the 302 is closed design. So it has a large flat section even with the head gasket surface of the head. When you combine that flat, with a flat top piston, you get the benefits of quench too. An added bonus. The 399 has a solid dome. It will get you the static compression, but you lose efficiency and the anti-detonation benefits of quench.