Pertronix flamethrower Slant six

I understand that the original Ignitor requires a normal ballast (0.5 ohm?) w/ normal coil (~1 ohm?), both resistances when cold (hard to measure so low). Instead, you can use just a "ballasted coil" (~3 ohm?). It sounds like the Flamethrower may be the later, so "should work" without a ballast. I suspect most engines don't need the "ballast bypass" feature during starting, unless in Alaska. I wired my 273 like that (temp ballast next to factory coil) until I change to a better system.

The Ignitor II is more like HEI and doesn't require a ballast. I think you are best to use an "e-core" coil with it. The Ignitor III adds multi-spark.