Herdsman,
Unfortuately, I don't have too many specifics on my CR since the engine rebuild was done by the prior owner. With 93 pump gas, I haven't had any pinging under load. I had a short spell of run-on which seemed to go away with the next tank of gas. Cam was described to me as a Ram Air III so I assume it's a 068 or 744 (not sure how I can tell without a tear down). Timing is set at 10 initial and I have yet to spec out the rest of the curve. Based on that I'm assuming that the pistons are dished. Factory advertised CR for the motor is 10.75 which makes me believe I'd be having problems if there weren't some sort of dish on the pistons.
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'67 GTO Conv 400 TH400
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