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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