The MSD p/n 8222 and Holley Sniper p/n 556-153 coils are epoxy filled and ohm compatible for electronic ignitions.

I do have spare ‘plug in’ style distributor caps for the CRT/TSP distributors.  Just send me an email if you fail to find a ‘plug in’ replacement on your end.

Just a few thoughts:
You said you don't like the cap/rotor quality, what about it ? I would Check the rotor where the carbon pin rests on, is it aligned, clean, dry and smooth ? Does it have good spring pressure ? It moves up and down ? Does the carbon move at all ?

Does the distributor have Excessive Shaft End Play ? If the shaft moves up and down too much, it can crush the carbon pin or cause inconsistent contact.

Rotor/Cap Mismatch, is it the correct cap ? Not all rotors and caps are compatible, even if they look similar. An incorrect rotor height can exert too much pressure on the spring-loaded pin, causing it to wear prematurely.

Is there good grounds connecting battery, car and engine ?

Correct gap for spark plugs, too big can burn the carbon.

It appears that maybe there are issues with the secondary ignition system. Some of the above excellent suggestions regarding off-shore poor quality and mismatched caps and rotors on a particular distributor are top on the list. With a depth caliper, measure the distance from the cap where it seats on the distributor to the carbon brush.  Then measure same from the strib to the rotor contact spring to get an proximate idea of how high or low the rotor resides within the cap. Since it's the carbon brush that's being destroyed, a gap there would create arcing voltage which would cause very high temperatures there.   If the rotor is positioned too high it probably would come in contact with the upper cap and tower conductors also.  As one stated above, I too have had my share of issues with aftermarket ignition components and systems. After an MSD 6A box failure, I converted my 64 truck to a Ford Duraspark system that performs flawlessly but that's a subject for another thread....

Even though you are dealing with off shore "stuff," it doesn't hurt to try to solve the issues.  Since the carbon brush is failing resulting in a lot of carbon deposits on the inside of the cap, cross fire now becomes a reality causing backfire. Ozone is yet another product generated by the higher voltage which is highly corrosive if not properly vented.  I think it's safe to say the quality of this off-shore stuff is not consistent with some having no issues and yet some folks reporting many problems as you are.  Your coil is one with a low primary resistance and you are running without a ballast resistor. That combination makes for a super hot and very powerful spark. The cap and rotor are more than likely not up to the task like the high quality extra WIDE caps and rotors used by the OEM's before coil-on-plug became standard. If running a small cap then it must be top shelf quality. It was suggested above that possibly since it looks like a GM copy, try following up with that in mind. Otherwise, the ignition system could be toned down some with a coil having a primary resistance of about 1.5 ohms? Maybe by doing that would allow the cap and rotor to live happy.  After all, how hot of a spark do we really need for our build? These are just a few of the many things that come to mind....

They are making an attempt to address the mismatched/anything goes ignition parts being sold these days - this is encouraging. Would you post a picture of the inside area of the cap showing the conductive posts and carbon brush?  MSD is cast on the top surface but years ago, the quality manufacturers used to  cast in their "hall mark."  Just curious if MSD has any marking as such in there....

Thanks for the pics, there is no manufacturer's mark in the cap but that doesn't mean is won't be a good product. It does have an ozone vent and with the included instructions to insure the rotor spring is set right shows they are trying to get it right....we'll see.