Ballast Resistors
I think the frequency is way too low for skin effect and other RF effects.
If they're exclusively RF effects, then, yes.
I tried to get some numbers at the frequencies we're talking about, but those numbers may be wrong.
And if the skin effect at those frequencies is 0.005", and the wire is 0.010" (just a guess there), then the wire is all skin, and there's no effect.
But there's definitely an inductive effect.
The nominal inductance of an old style ignition coil is approximately 100 mH.
It looked like it was around 5 when I tried to find it, but, as I said, I could find nothing specific for the coil types we use. It'd be great to find an accurate spec. (or someone with an inductance meter).
– Eric