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Sounds like fuel delivery, not ignition.
Too lean: coughs/barks, wants to backfire through carb
Too rich: stumbles/gurgles, chokes on itself.
With that radical camshaft you mentioned, you may have it richened up to compensate for poor booster signal at low speeds, then it is too rich at higher speeds.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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