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 - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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