Hi all.... While I wont disagree with the idea that a distributor in good mechanical condition, with a good quality set of points in it that are properly adjusted will function very well, a lot of us have switched to one of the electronic conversions. Without going into all the physics of it, you are basically replacing the mechanical action of the points with an electrical opening and closing of them through a transistor. Some systems use optics, but generally they use a magnetic system that generates a small current that ends up signaling the coil. The one caveat I have had with these systems, is with a vehicle that has or had a recurved distributor or an older vehicle that has a different curve than the newer replacement distributors the Pertronix worked well in that the curve was not altered. For most other applications in my fleet, I have had an easier time overall with the Mopar system. The replacement ecu is generally easier to find, quite often on the shelf at most Chry dealers, or thru most of the aftermarket parts houses. There is nothing wrong with Pertronix, I still have one on a car, but you generally WONT find one on the closest store shelf, when it fails and the car is sitting on the wrong side of town, in the dark, in the rain and youre by yourself. Just my 3 cents on this one...thanks everyone Take care Mikey 62 Crown Coupe