It is common for people to choose too much carb and too much cam, so people choosing too much compression for the application would not be surprising. If you're concerned about detonation on your pump gas, then go with the lower C/R and build the quench. Your already using aluminum heads which will help.

Can someone calculate the difference in power between the 2 C/Rs? I'll bet it's not much.

And why isn't there more discussion about quench in this? Isn't it an important component in this combo?