If it was timing, it wouldn't run that well for that long, so it's something else. Aggravatin' part is that it's apt to turn out to be somethin' really simple.
Check for an air leak when it starts to act up by spraying carb or brake cleaner near where the manifold joins the head and down by where the carb mounts to the manifold, as well. If that's a problem, I'd sooner suspect the upper end opening up a gap as the manifold starts to heat up.
You didn't mention your ignition condenser. That'd be worth checking out. What I hear, about one of of three or four is bad right out of the box.
On the oddball list, are both ends of your coil wire seated firmly in the cap and coil? That one bridge/connection can shut the whole works down.
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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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