Electronic ignition for Slant 6

I have been running the Pertronix I in my cars for over 20 years now.Never had a failure even on high mileage daily drivers. Not saying that there aren't failures as everything and anything can fail.
Maybe do what ever your budget allows.
I run a Pertronix I in my slant six and use a stock coil with a ballast resistor. I notice some people don't use a ballast resistor when they run the II or III. Do you find that the case, and do you still use a ballast resistor in your Pertronix I like I do?
Thanx