Streetspark/DC ignition?

The GM HEI used an E core that is faaaar more efficient than the canister coil Chrys used. It had a 0.6 ohm primary & no bal res. Chrys coils were about 1.5 ohms plus 0.5 ohm for the bal res.

There is no comparison. GM cars had mostly 060 plug gaps, some had 080. Chry had 035 plug gaps. The plug gap is a measure of the energy of the ign system.

The only real benefit, & it was a very good one, of the Chr system was that it eliminated the points; but the performance of the ign system was still reduced by using the same coil & Bal Res used with the points system.

Not sure what Ford used.