Need help understanding Mopar ignition…no spark

Sdriche said

I appreciate the advice. The GM HEI is mounted to an aluminum plate with the correct paste. I tried 3 coils (original mopar, MSD cansiter, and the new FD478. I think i can rule out a coil failure. I verified a full 12v and despite the full 12v wired a relay direct to the battery to make sure.

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Sounds like you are down to a trigger problem (distributor pickup or poor connections) or bad module

However DID YOU check the voltages as I outlined. This is IMPORTANT, AKA do you understand how the key/ IGN2/ bypass circuit works? You MUST check that you have power when cranking AND doing this while using the key rather than jumpering the start relay