yeah, those Hotchkis A-body UCA’s take a wide turn from the UBJ’s..... I could not run rear mounted pin calipers with 11.75 disks. I had to swap spindles side to side and mount calipers in the front. -not sure about slider calipers.
That worries me about 13” disk upgrades too.
I want them rear mounted so I can run brake ducts.