IMHO buy a cheap auto parts store black coil (usually oil filled) ::
I have thrown away THREE Pertronix coils due to erractic spark over the past four years. The first was an oil filled one and the last two were epoxy filled. They were JUNK. Don't buy into the marketing hype. :wall:
I LOVE Pertronix ignitors :: but feel their coils are pretty terrible.
Beware, If you have a Pertonix II you must use their low impedence Flamethrower II coil. ::
That's why I now use only the Pertronix I.