OK.
Lets sort out the crap from the bullsh*t.
The Holden HEI uses the Bosch 4 pin module. I have compared these on the bench with the GM HEI module. The Bosch pulls 5.7 amps, the GM 5.5 amps. More is better, because it is the HEAT in the spark that ignites the mixture. Coil voltage is merely the enabler. A 50,000v coil is trading current for voltage if only 25,000 v is needed to initiate spark.
Coils.
You want an E core or O core coil for max spark energy; they are more efficient than canister coils.
The ign module.
Chrys 'boxes' do not have variable dwell. Bad. GM HEI & Bosch do, so the coil 'on' time is varied according to engine rpm. No point in having high dwell [ coil on ] at low rpms because it is not needed & just heats up the coil. The coil has copper windings, & the resistance increases with heat & reduces spark energy.
The best deal for the OP is a GM HEI dist, upgraded with the MSD # 83647 module.
This module switches 7.5 amps for more spark energy & has an adjustable rev limiter. Of course, it also has the desirable E core coil, & wider dist cap to reduce the chances of crossfiring inside the cap.
