In the late 60s the big new thing was capacitive discharge ignition. The problem with gas engines back then was leaded gasoline fouling the plugs. So they decided to burn the plugs hotter and open the gap with capacitive discharge ignition. I don't hear much about that anymore. Unleaded gas was started in the early 70s.

Race engines always needed higher power coils, dual points etc. to run 10000 RPM. That was due to the dwell times are just to short to get the energy into the coils.

I'm still open for info on what advantage there is to using a different spark set up on our low compression engines. What is better, more voltage or more current. Does a higher voltage spark ignite fuel faster than a lower voltage with more current? If it ignites the fuel faster, wouldn't you need more advance timing? So as long as you don't get any miss fires what are the benefits?

Does the higher voltage cause our distributor cap to fail sooner since it was not designed for that voltage.