KH Discs vs 73+ Discs

I agree with you on the BBP conversion for all of the reasons you gave. IIRC the largest SBP wheel was 5½" wide. Even at that width, Ma Mopar's wheels were known to be a little bit flexible along a vertical axis. This allowed my first Dart to shed wheel covers when cornering vigorously.

Just finding a tire in a 14" or 15" size is getting tougher all the time. Selection is not good.