Never overlook the distibutor itself, worn bushing, and or worn or incorrect advance. Worn or loose reduction drive gear on distributor. Ideally the spark should occur near tdc at low idle and advance gradually as you speed engine and be fully advanced at rated engine speed of 1450 rpm. Total degree of advance will depend on head, pistons etc it is equipped with, like 22 degrees with fire crater or 30 degrees with flat head aluminum thin wall sleeves and or as much as 40 degrees if it has original size bore. All gas heads figured. Also the spark should not flutter back and forth more than a couple degrees when watching it with a timing light. Excessive camshaft end play can also make spark jump around along with worn gears etc. Some of these old h's still have distillate or kerosene heads on them and comp ratios are so low they run rough on modern fuels.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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