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You do not say what ignition system you have. If you still have points, check the gap (should be 0.012 inch) and the distributor timing. It sounds like your timing might be retarded which will give exhaust backfires as will collapsed points.
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76 911S, 2.7, Bursch Thermal Reactor Replacements, Smog Pump Removed, Magnecors, Silicone Valve Cover Gaskets, 11 Blade Fan, Carrera Oil Cooler, Turbo Tie Rods.
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