Still have not found the source of this issue. Took the dizzy off and looked at the pick-up. The wire to the pick-up looked as if it was rubbing on the pick-up base plate and wore through. I'm sure it shorted out. But I replaced the pick up (while at it, changed the advance curve less 2* and put in a weaker spring). After reinstalling it, still no spark. I just read a new post where someone had the same issue so I will try those potential solutions as well. I have another ECU and will try that but I'm going to test my fusible links again as I bypassed the Ammeter a few months back.