HEI conversion problem: no spark while cranking

Been running HEI for 5 years on a daily driver 70's Mopar without so much as a single glitch or no start.
I also built and sold LOTS of HEI conversion kits here, and any problem that kept the car from running was either an installation error or a problem with the car wiring causing low voltage, or the module wasn't grounded well.

Trailbeast,
Tell me about your conversion kits or direct me to a place on the forum/internet that I can learn about it, please. Do you still sell them? Pictures? I'm very interested. The components on my car appear to be a hodgepodge of parts.