OK, I think we have talked about this about a billion times, but why not once more. And PLEASE read the Pertronix Instructions that Gary and I recently posted in the Photo Gallery under "Technical Data". And after I have posted this, I will merge the threads together. Ah, the power of a moderator...
But in a nutshell, here is what you need to know. If you wire it differently, you do so at the jeopardy of contravening the Pertronix instructions, and possibly the warranty.
If you use a stock coil (or stock type, as in one that has NO internal resistor, and hence its internal resistance is 1.5 ohms or less), you MUST power the coil and the Pertronix with SEPARATE wires. The coil MUST be powered by the stock resistor wire, and the Pertronix MUST be powered by a NON-RESISTOR wire.
If you have a coil with 3 ohms internal resistance, you MUST power both coil and Pertronix with a NON-RESISTOR wire.
In both cases, simply find the location on the fuse box where the clear resistor wire hooks up, and run a parallel non-resistor wire. If you use a stock coil, use the new wire to power the Pertronix, and leave the coil connected as stock. If you use an internal resistance coil (such as the 3 ohm FlameThrower Pertronix coil), disconnect the resistor wire and power BOTH the coil and Pertronix with the new wire.
That's what the instructions say, and for good reason. Powering the Pertronix with the resistor wire will cause it to receive too little voltage and may cause it to malfunction. Powering a 1.5 ohm coil with a non-resistor wire may cause the coil to overheat and cause damage to the Pertronix. Powering a 3 ohm coil with a resistor wire will cause lower spark voltage and undermine all the good that the Pertronix has done.
HTH