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Be careful how close the terminal wiring comes to the tip of the rotor- - - -it's possible to get a flash over to the primary wiring as the coil fires, particularly on the "short cap" distributor that was used on 6V ignition systems. That will cause an intermittent miss, mostly on an uphill pull at heavy throttle. A slightly dirty spark plug, a wide plug gap, or a high resistance plug wire will make that problem much more likely to happen.
Jerry