65 273 with electric ignition

i just purchased this car knowing it stalls after warm up. I am chasing a few things and want to make sure it is not ignition that is acting up. It has a mopar performane electronic ignition kit. I have read that a ballast after it gets hot can cause it. But really do not know much about it. Any ideas were to start?
That's what a ballast resistor does when its working - it gets hot.