Tuning with jets, Power valves and an O2 guage

No you haven't Not with the distributor curve. Ant that's where I think you may could cure the problem. Could more quench solve it? Maybe. But which is cheaper and easier to try? Tearing the engine back apart, or removing and curving the distributor? Just trying to stick with the simplest methodology first. You've already gone back into it once and it seems to not have change it. You say there are times it does not spark knock, so you HAVE to be close. Yes, I saw where you said it runs good on 110. What does that prove? That it has too much compression? How do you know? Have you ruled out too much timing yet? NO.