Go with Dave's rec for the gap. A larger gap will require the coil to generate more voltage to fire the plug, that in itself is not necessarily good or bad, but as the coil voltage goes up, the spark energy may begin to leak off thru poor wires, etc. A .045 gap should give you no issues and still gives the advantages of the better ignition system...back then with points, the typical gap was .035, partially due to the limitations of the point-triggered system. In higher perf applications in the day, dual-point distributors were used to increase the dwell to improve ignitions, but that's another story.......
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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