I think I have the original pertronix on my ford and I just chucked the resistor. I have pertronix coil and msd wires, ngk plugs. It's been running like that for 7 years. I put an msd box on it last summer though, because I added nitrous. Still works great to 6500 at least.

"The first rule of overkill: You can never have too much overkill."
"Overkill is underrated."