Total Timing?

With all the talk of initial, mechanical, and vacuum advance I was just wondering Shane, what grade of gasoline are you running that the engine was pinging on with just 12* of initial timing? What kind of compression does the engine have? You`ll need no less than 91 octane with a lot of timing and moderately stout compression. Run 93 if you must. Pinging or detonation is really bad for your car, avoid it at all costs.