For most stock type systems, and by that I mean points, Mopar ECU, or Pertronics (switching) eliminating the ballast is a BAD idea, here's why:

The entire reason that ballasts are used is to do at least two things:

They help to regulate current through the coil with changing rpm and voltage changes, IE lower voltage at idle, higher at cruise, and.....

one more very important function is that coupled with a bypass circuit for starting, this gives you a nice hot start under cranking conditions.

To my knowedge, there ARE NO old school, coil/ switching type systems, with the possible exception of the GM HEI which do NOT use a resistor in the ignition.

All it takes is just one cold dark night, a little humid, and you and your "girl" have listened to the stereo a little too long, and now the cranking speed is a little slow, and you top things off by nearly flooding the engine. So there you are, the spark is weak............