EFI Conversion

Many ignition systems don't need (nor "want") a ballast. The GM HEI doesn't even with a stock Mopar coil. I don't believe you need one with Pertronix, could be wrong.

NO CDI (MSD) ignition needs a ballast. It is important to remember that a "discharge" (CDI) works completely different than breaker points or "switching" electronic. CDI works more like a photoflash. There is no DC battery current through the coil with CDI