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

72bluNblu said

Because it’s literally the same spindle as the 73+ A body? And he’s using slider calipers which is the same as 73+ A body? And SSBC is a flaming disaster?

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Yup, same exact spindle/knuckle and rotor are used in the '73-6 A-body and '73-4 E-body. I've done dozens of those swaps (both front and rear caliper locations) without an issue. You do have to use the '73-6 A-body upper control arm and ball joint, or, the tapered adaptor for the early ball joint stud though. Swapping caliper locations requires some different hoses too so they don't rub or bind.