I have not read that a Mopar ECU can drive a hotter non-ballast coil. One could try that, but you may find melted epoxy running down your inner fender from the ECU. Even my after-market Crane XR700 ECU says to use a ballast with the coil, as I understand the original Pertronix Ignitor also requires.
The earliest Mopar ECU's also needed a 5 ohm ballast for the ECU supply. Those had the 4-pin ballast. The other ballast was ~0.5 ohm for the coil. I think the 2-pin ballast was the same ~0.5 ohm. You can't accurately measure 0.5 ohm with a multimeter, and the resistance goes up greatly with temperature, i.e. in use. Better to rely on getting the correct PN for your car.
