Bypassing dual ballast resistor

Going by your screen name, I take it that you're working on a '74 Dart Sport?
If you're running MSD, then I assume "stock looking" isn't an issue. Take the two wires that feed into the ballast from the ignition switch (these are your IGN1 and IGN2 circuits, one supplies voltage during "crank" and the other supplies voltage during "run") and splice them together, and connect this splice to your MSD feed. Then you can just get rid of the ballast and the Chrysler ecu entirely.
And while you're in there cutting and splicing, get rid of that '74 one-year-only seatbelt ignition interlock, too. Search for threads.