Not sure if this helps. I did a drum 69' dart from a 70' dart disc brake swap last year and used the lower ball joint from the drum one, but I had to drill out the lower ball joint holes that attach to the disc spindle. I know the K&H is a different set up then what you have but just trying to give you an idea. As someone mentioned, you need to swap sides with the calipers for clearance and bleaders on top. If not I believe they will hit the suspension or frame. I forget which.