Hi all.... Just a trivia thing, the pertronix and the mopar elec unit are basically the same technology. both use a magnet that rotates to excite ( induce, seduce.....youll get the idea ) a very small current in a stationary winding. ( this is basic electricity 101, move a conductor thru a magnetic field ) this very small current is used as a switch thru a transistor, that in turn makes the field in the coil collapse and that induces a much larger voltage to the spark plug. dick b. could explain it much more accurately than I, this is a bare sketch. i like both of these systems, the pertronix hides easily, and unless someone is really looking for it..you really dont notice the 2 small wires. another plus, you get to keep the existing distributor curves, which sometimes can be a plus if youve had a distributor recurved and set up for your car. the mopar set up is easy to do, can be done as the kit from mopar or from parts and pieces. in fact, the schematic to install one is in our archives i believe. the one plus to it, is when the box fails you can get one fairly easily, which may not be the case with the pertronix - especially if your car is sitting in the darkest, lonliest place you would never ever normally leave it some evening. either way, its up to you....when I did use pertronix, i carried a spare. they did sometimes fail without warning and they dont like it at all if the key gets left on for an extended period. i have heard they have been improved upon, but i dont have any personal knowledge of it. have fun Mikey 62 crown coupe