Do you have a ballast resistor? Some high performance coils require 2 ballast resistors. Since we don't know how your coil is wired, we can only make a few guesses, but let's start here.

As a side comment (and this is a personal opinion) you should avoid anything with Pertronix on it.


~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end