KB HyperT's?

Clearance on head to piston? I run KB-107's @ zero deck with a Fel-Pro .039 gasket. No problems. I have run tighter clearances. Sometimes the slug shows signs of pitting. "To close" so I run the thicker gasket. Fuel requirements are also concern at times. So running above "That point" can become problematic.
Also consider rod stretch. Older rods can have more stretch than a newer rod and a quality race rod has less stretch. Different materials stretch more than others. Play it safe and worry not!

For street rides, 10-1 iron headed and 11-1 aluminum headed is where I yield it at. I have run higher compression engines on pump gas before with a point plus in the ratio, but as I stated before, again, fuel can be an issue at times.

Figure a basic 3% increase in power from 1 full point of compression but your only going a 1-2 point at the edge now? Not worth the headache. You'll never feel the difference.