bad misfire and ignition problem.

Sounds like the way the old farm tractors were wired.

Hot all the time push button, but a toggle switch next to the push button to turn on and supply power to the coil.

Edit: if this is so you need a ballast resistor inline after your toggle switch to reduce the power to the coil to 7 volts for the mopar ignition.

You do not want the full 12 volts going to the coil.

HEI conversions use the high voltage square e-coils and they run the straight 12 volts without over heating the coil.

Feel your coil after leaving your toggle switch on for 20 seconds. If your coil starts heating up, you need to get the ballast in line.