66 valiant disc break conversion

In converting my 66 valiant over to disc brakes, my question. I took spindles off of a 82 new yorker, put 67 bellevider lower ball joints on them, i was told that the 66 valiant upper ball joint would bolt right up, it does not. Will the 67 upper ball joint thread into the factory valiant upper control arm? I cant find any o.d., specs, to compare. Thanks for the help.