Slant 6 HEI problems

Killer6 said

Just to be clear, this spark checking is right after the vehicle stops running &/or restarts, or is this the spark quality cold before the initial drive? The spark should be bright &
blue with maybe a tinge of orange. What are You using to test the spark? Is the car on the choke for the 5min., how long will it run just sitting idling to warm-up?

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I experienced similar symptoms right after finishing an install. When I reversed the two wires that come from the distributor and all was well. I reversed them again and the engine ran poorly. I switched the wires back again and the engine ran well. I think it may have something to do with a sine wave trying to efficiently run the HEI module that is looking for a square wave. Don’t know for sure that i’m correct on this, just guessing.
Jerry in Denver