HEI distributor

To answer your "don't understand" general question, Mopar was the first w/ electronic ignition ~1971. Transistors and electronics were primitive then and 2 ballast resistors were needed to control primary current and ECU source. When GM's HEI system came out later, they had "electronic dwell control", which eliminated the need for a ballast. That was more efficient and gave a stronger spark, which people then worried might even stop your heart. Mopar did similar, but inside their 1980's "spark computer" (lean burn) box which had problems w/ connectors and cooling so nobody goes there today. Ford's similar system was "TFI", I recall. Thus, your term "Mopar HEI" is incorrect.

For your case, post #6 shows you how to get true HEI cheap and easy. You also need the cute blue e-core coil shown, or an equivalent (Mopar Magnum engines, MSD, Accel, ...). Also, open up your spark gap to ~50 mil to get full advantage, and be careful touching things since the heart-stop fear could have some truth. Some here claim points distributors are just as good, but nobody jumped 6 ft from those sparks. View youtube's to compare spark pops from each.