Take the diagram shown here and replace the coil, with a FD478 coil…I have this exact setup wired the exact same way, although I tested it with a canister coil too. I have a new GM hei module coming tomorrow…let’s see if that changes anything.
You DID? break the "tit" off the bottom and mount it flat on something for a heat sink?
What did it do, AKA run for awhile and then quit? Do you have ANY coils lying around?
I would de-wire the power wire and hot wire it direct for testing. You should NOT be using a ballast.
CHECK WITH A METER to be sure you have full 12V to the module and the coil BOTH with key "in run" and with key "cranking"
Remove and "work" the distributor pickup connector in/ out several times to scrub the terminals and "feel" for tightness. Pay attention to the diagram polarity to establish what is called proper "rotor phasing." That will not prevent spark, but will offset the timing and cause issues.
I do not know anything about that particular coil. I will tell you that I ran an HEI module for two summers with the old canister stocker coil off my Dart, worked fine (no ballast)