compression ratio vs octane

What gearing/convertor/clutch does the car have? You dont want to clean the plugs and then look at them. Just pop a few new ones in and drive it as you normally would for a couple miles, then look at them. If you see small blue or black spherical deposits, or any metallic looking material, you're detonating or pinging whether you can hear it or not. I can get 94 Octane super at Sunoco gas stations in CT... You may need that. But you can also tailor the vacuum advance and mechanical advance so it doesnt come in as fast if the convertor is tight and gearing is high. You also may need to carefully tune the carb to work with those curves too. Pinging will almost always be much louder than rockers, detonation you may never hear anyway.