318 piston's and quench

Here's my take.. You should avoid running a piston with no valve reliefs at all. I think there's some confusion on building for quench. It's a combination of the block's existing deck height (not what the books say - but the real measured current height), plus the head gasket used, and the head choice. QUench is only effective if the parts get close. If they are more than .050 or so, there's no real benefit. If there's .040, there's some. If there's .030 it's pretty powerful. Less than .030 is best but parts can start hitting if you're not really good at it...lol. With a tall piston and small bore, I'd want .035-.045. The thinnest easy-to-get head gasket is .028, the regular replacements are .043. So you want a piston that has a valve relief because modern cams have different valve timing and no relief can hit even on small cams. And you want that at zero deck. I'd use the KB-187s. Then you use the head chamber size (get them to 64ccs) to set your static compression. You MUST have the block blueprinted to get the height right, but it gives you a quench of .043 and a static just under 9.5. Keeping it there and even with a small cam you can run low octane pump fuel.