interesting car craft article this month on GM modules
from what I've heard and seen its the mopar coil that can't handle full voltage; only HEI coil can give full spark voltage and be reliable
the mopar ECU doesn't require the ballast, if you look at the wiring diagram the ballast limits voltage before it goes to the coil; the ECU controls the negative for the coil
Can you post a link? What is "this month?"
GM modules "work differently" than do Mopar boxes. You don't need a ballast resistor. Also, because of worldwide quality decreasing, and for the less popular Mopars this means "worse"
With a GM module you can even run a factory coil (I do) with no resistor
With a GM module you could even hide it in a Mopar box -- been done -- (I don't)
I haven't set up the ignition yet, but with EFI you can run a GM "8 pin" module and control spark from such EFI systems as Megasquirt and Holley. (I run Holley)
This is my "emergency / test" ignition, inside the box is a GM 4 pin and "just a coil." Clip to ground, battery, hook up dist. and coil wire, and off you go
The diagram
from what I've heard and seen its the mopar coil that can't handle full voltage; only HEI coil can give full spark voltage and be reliable
the mopar ECU doesn't require the ballast, if you look at the wiring diagram the ballast limits voltage before it goes to the coil; the ECU controls the negative for the coil