Scarebird disc conversion

The KH setup, while problematic does work well, but of course requires the Rally rim - ours works with stock rims.

Um... incorrect. My '72 Swinger has factory KH brakes and the original 14" steel wheels, and my '67 Dart GT has retrofitted KH brakes and uses the same stock 14" wheels. Guess you're referring to the 13" steelies not fitting with KH disks?