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"a bad connection may exist between the boot spring and the plug wire itself. as many of you have probably experienced, the boot is not easy to separate from the wire. I would be interested in any tips you may have to help me out here–hair dryer to make the rubber more pliable? I have to say that with all the coils I’ve changed, I have never had a bad plug wire until now."
Pretty common problem. To pull that old dry boot off the wire you just need a little oil in there. Use a tiny screwdriver or piece of wire and push it all the way down between the ign. wire and the boot. Then drip or spray a little oil into the tiny gap made by the wire/screwdriver. Repeat a couple times around the circumference of the boot. Then just pull the boot straight off of the ign. wire. Works like a charm and only takes a minute. After the wire and spring are out of the boot, strip 1/8" insulation from the wire and splay out the wires. Reinstall the spring back onto the wire in a new position. Press the spring point into the wire with pliers. Push back into the boot. Very rarely ever necessary to replace the ign. wire on those 50’s motors.
I am sure you already know that the Green German Prufex coils screw onto the wire instead of just push fit like the original OMC coils. Must screw the wire into the coil terminal.