Not Ranked
I would definitely talk with Tom Lucas of FE Specialities in Sacramento, who built my engine and also built rodneym's twin Paxton engine build. He's based in CA and knows the gas here. As you probably know, CA gets a "special" formation of gas from the rest of the US. I would not build an engine with a CR in the high 10's. You're probably going to spend a minimum of $15,000 on your engine and I wouldn't be rolling the dice with detonation with a $15,000+ investment.
I've had engines built in a bunch of cars over the years, Corvette, Tiger, Cobra, Mustangs, etc. and I've had problems with 10:1 CR engines. If you want to mix higher octane gas, then that's a different scenario.
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