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My typical advice (which makes some cringe I'm sure) is to advance until it pings, then retard slightly. A stock canned advance setting was OK for a new engine of known specs, but now 40-ish years later the engines (rebuilt or not) are all a little different, as is the gas and operating conditions. Without getting into the fuzzy area of recurving the advance curve by messing with weight and springs, advancing until it lightly pings and then backing off slightly will generally give you a pretty good timing setting.
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I'm JohnMc, and I approved this message.
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