You are asking the wrong guy here, I don't do resto stuff so I don't know the answers you need.

I do know the factory used carbon core wires on electronic ignitions though, because I replaced many of them over the years. Cheap radio interference suppression that still carried enough energy to fire the plug was all they cared about.

I suspect the person having the issue with the repro ones was due to poorly made wires and not that they were carbon cored.