The easy way is to start the car and wiggle the HEP wires coming from the dist. while the car is running. The problem is usually in the wires. Wiggle them in as many places as you can, and especially where they come out of the distributor. If you notice any stall/stumble whatever, thats how it works.
Spark and fuel while cranking for 20min? If its a hep, it will be a no spark condition. If you checked for spark say a month ago when you last pulled codes, you cant go by that. HEPs can fail at anytime and intermittently.
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