Runs on start and dies on run. No question. That's the ballast resistor circut. On a points style dizzy, The ballast resistor cuts the voltage down to 6 volts to preserve the points. 12 volts, all the time, burns them up quick. So, cars of our vintage installed 2 curcits. A full 12 volts as you start the car, to ease cold starting. Release the key and you're on the second curcit, through the ballast at 6 volts. When we install the EI dizzy, we bridge the ballast, so it's 12 start and 12 run. This will over heat the stock coil so that needs to go as well. If you've done this, something is wrong at that point. Start at the connections you made and hopefully the error will be evident.