Need help with no spark

Karl:
1) Do you have a picture of the ballast or a PN?

2) One thing to note: there is a missing wire in your original schematic back early in the thread; it shows in the schematic that Bad Sport posted in post #61 and is labeled 'IG2' at the ignition switch. It is a brown wire in the original harness, and connect to the low voltage side of the ballast that also connects to the coil+. You bypassed the ballast in one test so this is not likely the issue but it needs to be fixed. It provides +12 direct to the coil + when cranking for a hotter spark.

2a) If you have a tach, disconnect that and see if the system will fire.

3) You can segregate the problem somewhat with the following test to help focus better on the problem area:
Disconnect the coil - wire from the Mopar box (and anything else like a tach). Put the key to RUN, and using an alligator jumper grounded at one end, touch the other end to coil - and look for a spark each time you remove this ground connection from coil -. (Don't be touching the jumper end when you remove it!) If you get a spark each time, then the coil and ballast are good and you can focus on the box and distributor.

4) How are you testing for spark? I'd disconnect the wire from the coil out of the distributor and put the open end 1/4" from ground and look for a good blue spark. This bypasses any issues with the distributor cap. Don't test at a spark plug in open air; this does not at all simulate what the spark really has to jump in a compressed fuel-air mixture.