I put an HEI 4 pin on a Mopar electronic distributor. Both the GM HEI and Mopar reluctors emit a square wave signal, so it works just fine. Mopar points, and electronic distributors use the same cap and rotor, so this works fine to hide it to appear stock. Just going to either ditch the ballast resistor, or hollow it out and put a jumper wire in it to complete the deception. Pertronix units work fine, you need to ditch the ballast wire or ballast resistor for them to work.
My buddy built a 68 chevelle with a 396 and put the ole fat cap HEI in it. Again not a big fan. I think those are the ugliest looking distributors ever made. They work great, but fit like crap. Anyhoo, the car would nose over at 4,500 rpm. I asked him if he removed the ballast wire under the dash going from the ignition switch to the coil. He said no. I told him to ditch it for a regular copper wire. Told him he wasnt getting a true 12V to the HEI. After that, this thing would pull hard to 6,500.
Heres pix of my GM HEI 4 pin Mopar electronic distributor. I made a homemade wire adaptor plug that plugs into the GM module, and Chrysler pickup. The other 2 pins go to an oil filled pertronix 50,000 volt oil filled ignition coil to complete the deception. The module mounting bracket I actually bought pre made off the interwebs. $25 it was not worth it to try to engineer anything similar.