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.
You can find youtubes of various spark systems. Perhaps the best factory system is GM's LS coils. Like most, they use a separate coil per cylinder. But, that requires crankshaft and camshaft sensors and a controller to command the sparks. The Megasquirt site has much info.
