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

Just so you know;
I have done this swap twice; once on an E-body, swapping the calipers to the back, and
once swapping F-body brakes onto an A-Body
Both went without a hitch.
Point being that the Factory parts do fit. So, hang in there, The guys will try to figure it out with you.
Thanks for the enlightenment. If the ball joint surface was flush, would not be having this problem. Don't have to have a sway bar but have gone through a big effort to acquire the lower control arms. Mine are in perfect shape and ready to go but don't have tabs. The newly acquired ones are OK. Left side is marginal. Still looking.