Before this thread gets WAY off track...
1. The OP wasn't 'Completely Satisfied' with the HEI clone, or he wouldn't have changed to a Jeep/Motorcraft distributor & MSD module.
2. The HEI clone has a 'Mid Range' hesitation/bog that is probably too much timing under 'Part Throttle Cruise' that about all the HEI clones have.
Most of them have an advance curve set up for a Chevy V-8 engine, and that doesn't work with an AMC I-6 engine very well.
3. MSD Modules DO FAIL, just like any other ignition modules do.
I would suggest a 'Test Module' be wired in to replace the MSD unit for testing,
And if so inclined, run until the MSD module can be Serviced/Replaced under warranty.
MSD has traditionally had an EXCELLENT customer service, and repair/replacment has always be prompt and FREE.
4. I do suggest the OP tunes the HEI clone for his engine since the 'Hesitation' or 'Bog' felt in the 'Mid Range' is usually detonation/pre-ignition, and that is VERY hard on the engine.
This can be done with springs, or with a vacuum advance limiter.
5. Running the Jeep/Motorcraft distributor with an HEI style module costs about $25, and will answer the question if the 'Issue' is/was the MSD unit, or the Jeep/Motorcraft distributor it's self.
Remember, there is more than one component in the ignition system, and it could be the stator (Trigger) in the distributor, it could be the ignition coil, it could be power connections to the module, ect.
A 'Test Module' would answer a bunch of those questions, and keep the 'Better Curved' distributor in the engine,
And that would 'Verify' the rest of the smoother running ignition while giving the 'Smoother Running' module a chance to see the guys at MSD if something IS wrong...
In my OPINION...
He would be better off with a 'Test Module' set up to run the Jeep/Motorcraft distributor since the Jeep/Motorcraft distributor is set up with the correct advance curve for his engine,
And the 'Test Module' would also be his 'Self Rescue' if the MSD module fails on the trail someplace since it's already set up to plug into the harnesses after this...
The 'Test Module' made from a HEI style module won't be nearly as powerful as the MSD unit is,
But it doesn't come with the potential for problems he can't fix with the HEI clone.
Wiring for 'Test/Rescue Module' is fairly easy, and the 'Hard' part is finding a heat sink material to mount the module on. (I use salvaged aluminum heat sinks from computers, TVs, ect. but you can flatten out a beer can if you need to in a pinch! Anything to extract and exchange heat from the module.)
Wiring an HEI module to a Jeep/Motorcraft distributor.
Use what ever wire you are hooking up to the HEI to power up the 'Test/Rescue' module and ignition coil.
Some things that might make a 'Rescue' module more easily installed...
Distributor ADAPTER harness, plugs into stock distributor and lets you tap the Stator (Trigger) connections,
Compatible with MSD wiring... But does drive the price up on the 'Test/Rescue' module.
If your factory module wiring is still in place, this will allow you to plug into the factory module power connector on the harness.
Works for both the 'Small Red' wire on the MSD unit, and for powering up the 'Test/Rescue' module.
You will only need the black 'Bell Shaped' connector on the right with red & white wires coming out of it.