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There is usually a tar-like substance inside ignition coils, and it is there for high insulation resistance and heat disipation properties. Leakage does seem to indicate an overheated condition in the recent past!
From the factory service manual, the primary of your coil should measure 0.4 to 0.6 Ohms and the secondary 650 to 790 Ohms.
Does your CDI-unit whine with the ignition switch turned on?
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Warren Hall
1973 911S Targa
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