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Chrysler cars, prior to CDI always used a stand alone ballast resistor that Ford guys said was because MOPAR were too cheap +/- stupid? to switch their coils to 12v from 6V,
so attached the resistor when they went to 12v batterys mid ’50s . .
In fact it was to allow 12v at the coil while starting, and 6v when running.
Quincy loopers using battery ignition used them also, and some early 6 cyl Mercurys ?
They should still be availabe at a NAPA store, cheap?
Use one in-line with a 12v wet cell battery. A dry cell lamp battery
will not supply the current for long.
We used big 6v ‘Hot Shot’ or ‘fencer’ dry cell batterys with the PR’s etc in racing .
Doubt they are still available .