I just installed a Pertronix Module in my new 292 engine.  My car originally had a ballast resistor.  I am using a stock 1957 Ford distributor.  The Pertronix instructions say to install the red wire to the hot side of the ballast resistor and the black wire to the distributor side of the coil. I am using the coil that came with my car.  I don't know if it's a six volt coil, but the engine ran fine before the tear down.  I wired the Pertronix module as instructed, but I haven't tried to fire the engine yet.   

I Googled the ballast resistor and it's purpose is to extend the life of the points by reducing the voltage when the car is running.  I don't have points now.  Why do I need the ballast resistor?  I don't remember ever using it before.  Why can't I ditch it?