<==1971 duster front end suspension! Need suggestions.

Upper ball joints are screwed in like a big bolt or pipe fitting.
I've seen front end tool kits for sale (approx $150) that include both size ball joint sockets. Even if you decide to use a pipe wrench be sure to clean the exposed threads (wire brush , WD-40, whatever) before backing out the old one. There are only 4 or 5 threads in the upper arm and they can be stripped.