Big difference between aftermarket electric chokes and the factory electric choke assist heaters and controller/timers used on mid seventy’s Mopars and how they are wired. Aftermarket electric chokes require power to keep the choke spring relaxed for the full duration of the run cycle, they have no other source of heat. They pull about 500ma of additional current to whatever circuit they are connected to. Ign. run is the preferred circuit, usually a blue wire at the alternator or ballast resistor. Not the at coil side of the resistor or at the coil.
The factory choke heaters pull closer to 2 amps of additional current and used a controller/timer to remove this additional current from the run circuit after about 5 minutes, where crossover heat then maintains the factory choke spring in a relaxed state for the remainder of the run cycle. Should not use a factory controller/timer with any aftermarket electric chokes.