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Are you running a vac secondaries or mech secondaries carb? Sounds like you may have a leaky needle and seat thats allowing a little drip while running. Check carb first. Then check plug gap before going hotter. If you're running an MSD box open up your gap five to ten thou over engine specs. Also fuel these days can be an issue. Try and run at least Sunoco 93 Ultra if available in your area. Good luck,
Mark
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