I have recently bought a HEI GM Racing distributor. It doesn't have a mechanical advance. I want to by an ignition system for it so i can advance the timing during different applications. I am leaning towards MSD ignition and I don't know what the best item to bye is. Is a distributor considered points ignition. How do ignition boxes work and how do they add power. If you know alot about ignition system for early model 350's work, try to explain it to me as if i were a little kid please.