Best I can tell the Autolite 386 was close to factory original heat range while 388 is a tad hotter, maybe better if compression is gettin low and she using a little oil or youre using it for light jobs or parades etc. A battery powered coil distributor ignition can tolerate resistor plugs better then a magneto where I prefer 3116 which I believe is a NON resistor plug. However the NON Resistor 3116 would also be okay regardless if distributor or mag so Id try 3116 or 388. A good tune up and good wires also helps regardless what brand plugs you run.
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