73 A-body ball joint socket

Some point around 1973 they started using the same large upper ball joint in all, drum or disc.
A good while back there was a member who found a odd size ( metric maybe? ) socket that worked good enough. Harbor Freight affordable too. If it works for you will depend on how well the joint is seized in the threads. I don't know how one would find that alternate socket info through search. Good luck though.