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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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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