You won't need a ballast resistor with a true "12 volt" coil.
Suggest you check the spark when the engine is cold. (Pull the wire from the center tower on the disributor, hold it a half inch or so away from the block and crank the engine). You should get a sharp, blue spark.
Then check it again after the engine has warmed up and quit on you.
If now you get only short, lazy yellow spark (or no spark at all...) look for a bad coil or condenser.
But also check the breaker point gap! If the gap's too close (ie. only a few thousanths) it can cause the same symptoms.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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