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The msd puts out multiple sparks probably starts 10 to 15 degrees early. I would try moving the distributor to retard the timing 6 or 8 degrees and see if that helps. or you could try the timing at over 3000 rpm for total timing as the multi spark is only under 3 K then only 1 spark. 34 to 36* total depending on your octane in fuel.
Perry
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F5 cobra Mark 4 roadster, Ruby Wine Red with pearl,
dual 2" roll bars, warmed up 302, E Street aluminum Heads, Comp cam and roller rockers, AOD, 4.10 Eaton Possi, Power Baer/disc brakes, block hugger headers, 2 1/2" under car exhaust, F500 18" black spoke wheels.
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