If you have one of those Skip White style "All in One" distributors there really isn't a simple way to find out if that's what it is. (but it probably is the HEI module)
All you can really do is to power your coil with the ignition and ground it's negative terminal (scrape it on a grounded surface) and see if you get spark.
If you do, then it's very likely the HEI module went bad.
A good description of what you have might help to decide a quick solution if you need this car to be running.
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It's the all in one style distributor, so you're saying pull the coil out of the distributor and see if it sparks, if it sparks it's NOT good?
I should also mention I have a factory electronic distributor and coil(s) coming up, I'm looking for an ignition box locally, hoping I can go back to oem parts that works. Car has ballast resistor on it, but is bypassed currently
