73 E body front disc brakes conversion on A body. Where did I mess up?

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Well, technically, you never actually spoke either. You wrote the words here.
I know, we often use words that are comfortable to use even when they are not correct for the application.
Many dudes say that their Mopar has a Posi.
Some call the clutch torque shaft a Z bar.
Everyone that I know calls it a drive shaft even though the factory service manual calls it a propeller shaft.