I had a heat-soak problem on my '69 GTS that had a Mopar electronic ignition installed by the previous owner. After fooling around with carb heat shields, fuel pumps, and all the other fuel-related stuff, I decided it had to be ignition-related. When electronic stuff gets too hot, it often malfunctions. The good stuff, made in USA in the '70s-'80s, was not very prone to having these heat problems. The new-ish OEM (or other) replacement electronic parts, from China, India, Pakistan, etc... such as ignition boxes, coils, ballast resistors, are pure junk for the most part. And I'll bet that's what is on DD's car. I had numerous resistors burn out prematurely. I had a fairly new Mopar ignition box completely melt, and all that plastic goop ran out of it. Of course the car died. The answer? My solution was to go with all MSD. When you install an MSD 6AL ignition box, the ballast resistor is eliminated. That alone is a great 1st step towards reliability! You will also have to buy the recommended MSD coil. And if you really want to make it bullet-proof, get a new MSD distributor too. Of course, due to the male distributor cap on it, you'll need a beautiful new set of wires too. But that's O.K., because I have had no problems with heat ever since I replaced all those crappy ignition parts.
