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Old 10-20-2021, 08:15 AM
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Join Date: Jul 2000
Location: BlueBell, PA or AL U.S.A.
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Initial timing is no way to set an 55 year old engine;

Try for 32-34* total ADV (vac ADV hose off), at ~2600 rpm, and a Q-JET to see if the problem goes away.