As others have said, the electronic ignition will not likely solve the problem.
This type electronic conversion, the Pertronix brand sold here, are simply a "point eliminator" product. They are not the "flame thrower" ignition systems offered for performance enhancement. (That won't fix your problem either, just create more ignition problems.)
The conversion kits are very easy to install, are forgiving of a "less than perfect" distributor as for shaft bushing wear, and very dependable. The biggest advantage is the elimination of points and condenser, that are getting harder to find that are any good straight out of the box!
The disadvantage is they are polarity and voltage specific. Once installed, you have to be very careful not to reverse the battery polarity or jump start with 12 volts (if 6v system).
As for the plug fouling, some things to look for:
Look at the color of the plug. If it is flat black, covered evenly in black soot, that is a sign of running too rich. Also black smoke (before it fouls) is a sign of too rich. Causes are flooding carb, restricted air cleaner, choke not fully opening, improper jetting or adjustment.
Again, looking at the plug. If the fouling is gloss black, clumpy, stringy, splattered black deposits, that is a sign of oil fouling. Worn or stuck rings will show as blue smoke (before it fouls) under load. Ring problems will also show as as excess crankcase blow-by, sticky wet oil deposits in and around the tailpipe.
Worn valve guides will show blue smoke upon start up, idle, and coasting down.
One other cause can be a blown head gasket into the pushrod area of the head. If that is the case, that cylinder will be weak even with a fresh plug, and will progressively get worse the more it is run, to the point that cylinder won't fire at all. You can pull the valve cover, start it up and look/listen for leakage.
And then there is "water fouling", coolant splattering the plug. That will show as steaming out the exhaust, overheating, and mysterious loss of coolant. Caused by leaking head gasket or cracked head
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