You should have a HOT, BLUE spark that will jump half an inch or more. If you do not, then your problem is in the ignition. I have seen failures in the coil and ignition pickup in the distributor.
Technically, the pickup in the distributor is called a PIP sensor. Early ones were housed in a black rubber compound that deteriorated over time. They were later replaced with a light tan colored one. Also, check the resistance of the coil primary. If it is out of range, it will cause a no-spark or weak spark condition.
While we are at it, don't forget that there are other things that will make an engine refuse to start besides spark. Compression and fuel are the big ones. Spark needs to be at the right time, compression will tell you if the timing chain or gears have failed.
The short answer is that there is no short answer. .
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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