Bakerallen,
The only foot starter switches that have the extra post on them for resistor bypass are the 12 volt 1955-59 PU.
I would check the voltage at the coil plus side with it running. If the voltage is above 9 volts you have the wrong resistor.
A coil and resistor will get very hot if the key is left on with the points closed if it is not running.
If it is backfiring through the carb the accelerator pump may not be working.
