Retarding the cam\timing will help, but the motor will likely run like a dog to get you to the point where you won't encounter detonation. Octane boosters supposedly do work, but only increase octane ratings by something like 0.1-0.2 per bottle. A friend of mine runs his 11.5:1 e-head '77 Trans Am on two bottles of octane boost (@ $3.50 per bottle) and puts 91 octane in and doesn't have audible detonation. He claims the octane boost is why, but he doesn't really know much about tuning, so it seems to me to be a disaster waiting to happen. I personally wouldn't trust my car to it. I'd just build the motor to run on pump gas to eliminate the worry (and have ;-) ).
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