Those mid-late seventies Chrysler choke controls should not be used with aftermarket electric choke heaters. They are designed to cut off, or reduce in the case of the two stage versions, after a few minutes, the current flow to the original heated devoiced choke springs as they pulled close to 2 amps of current at full voltage and additional heat would not be required later in the run cycle. Aftermarket electric choke heaters pull about .5 amps and are designed and calibrated to have full 12 volts for the full duration of the run cycle. Without the full voltage after warm-up, the choke spring will cool off and apply the choke while the engine is warm, only source of heat to keep the choke spring relaxed. A reduced voltage, as would be the case if connected to the coil side of the ballast resistor will result in the slowing down or prolonging the choke application outside of its design specs. At .5 amps, for most cars, a relay would not be required and is not specified by aftermarket carb manufactures.