it needs a 12v feed, not thru the ballast resistor.
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I dont recommend the Pertronix. I had bad results with it. I did back to back to back tests comparing the pertronix dizzy with my FBO dizzy and FBO box. With the pertronix the car would not idle correctly. Same timing both dizzys, no answer from pertronix as to why, although they did recommend different things to try (coil, direct 12v power feed, ect). Pop the FBO one back in and use its box, and car would idle perfect.
Plus the Pertronix you will need to grind on the head for it to fit (stock head).
