1973 Dodge Dart Sport won’t run right or stay running

Hello, I have a 1973 Dodge Dart Sport with the 318 and 904. I was driving down the road a few weeks ago and my axle bearings went out. After I replaced those I went to test the car out. The car wouldn’t stay running. You’d drive down the road and it would just die and when you try and give it gas it would sputter. I replaced plug wires, coils, check the spark plugs they are good, The Ballast Resistor though is really hot on the bottom but warm on the top. It’s weird because I just replaced that what could be wrong with the car?