Only cheap HEI works

I know this thread is super old, but I swapped the voltage reg over to the later model style, and still didn't have luck with the ignition working. Finally just bought a chinese NAPA ignition box and that worked, so I ran that for a while. I think when I was installing it I added a dedicated ground wire to the case. Eventually swapped the FBO box in with the intention of calling Don over there and getting it figured out, but it just ran right away. Ground seems to have made the difference