The Standard LX101 ignition box has a good reputation.

https://www.rockauto.com/en/parts/standard+motor+products,LX101,ignition+control+module+(icm),7172

Rick Ehrenberg from Mopar Action magazine sells the HR7500 ignition module. You can buy it from his Ebay store.

https://www.ebay.com/itm/225109916079?hash=item346998b9af:g:ZDMAAOSwtANelMZm

Don Gould at FBO sells the HRR688 ignition system. It's a Chrysler style ignition box and Pertronix 40011 ignition coil (you must use the Pertronix coil with the HRR688 ignition box)..

https://4secondsflat.com/Ignition.html

If you don't want to run a Chrysler ignition box - Pertronix sells an electronic ignition conversion kit for Chrysler distributors.

https://pertronixbrands.com/

Additional reading:

https://board.moparts.org/ubbthread...or-direct-replacemnt-hot-street-car.html

https://www.forabodiesonly.com/mopar/threads/hyrev-7500-ecu-box.421044/

https://www.forabodiesonly.com/mopar/ams/how-to-tell-a-fake-ecu-from-a-real-one.315/

https://www.forbbodiesonly.com/moparforum/threads/which-electronic-ignition.248030/