Electronic ignition help needed !!

Before you start trying to solve an ignition problem, insure that "no spark" really is the problem. Get an in-line spark tester. Next time it happens, hook it to a spark plug and see if the neon light flashes.

I had an on-the-road failure of the Crane Cams ignition box in my Newport, which I quickly found with the spark tester (trunk of most of my cars, $3 Harbor Freight) before I ran down my battery trying futilely to start. I had a spare Crane box in the trunk and was soon on the road. I even left the spark tester in-line until we got home, because I didn't want to risk turning off the engine. Regardless of the Mopar box you have, you need a spare in the trunk, even a cheap junkyard one.

Finally, I don't know why people fool with the old Mopar electronic ignitions, especially paying ~$200 for new setups, when an HEI type is much better, simpler (no ballast), and very cheap if you use junkyard parts. At this point, you can keep your new electronic distributor and replace the Mopar box with a GM 8-pin module, plus add an E-core coil for more spark.