Need help understanding Mopar ignition…no spark

one more thing
plug gaps need to be 40 to 45 thou
too small a gap creates a larger current, or at least a longer current flow, through the rotor button and the heat causes them to fall to bits
bigger gap increaes voltage, which reduces current, or at least the length of time that current flows for, keeps your little button in better shape
Original HEI had a metal rotor button not carbon.

don't go too big though, that just eats cap contacts and sprial wound leads

Dave