You discuss spark timing. That is a separate issue than spark intensity and is controlled by the distributor, so is independent of what ECU is used. The Mopar ECU requires a ballast resistor, as do some other early electronic ignitions (even after-market Crane Cams XR700). GM's HEI came out about 5 years later and has superior electronics. HEI controls dwell, so no need for a ballast resistor. Dwell is how long the coil is "charged up" before the next spark. It also uses an e-core coil, which gives a better spark. The Mopar ECU is "good enough", but as I clearly stated, it is much more work to wire it into an early points car than the GM 8-pin HEI, so why go thru more work for a poorer system? If your car came w/ the Mopar ECU (1971+ or so), smart to keep it as long as you can still get quality parts.
