It is a special socket
The one I have---but cannot find---is a 3/4" drive socket and I had to use a reducer for a 1/2" drive breaker bar.
Chances are real good that that sucker is in there real tight------gonna need a lot of leverage to get it out.
Have not worked on a Chrysler product since the 80s.
I did the front end on a 67 Chrysler 300-----440/4-spd car----stolen in 89
When you do find a socket----soak the threads with some penetrating oil for a day or two---might come out easier.
I would not worry about the threads----they will probably be okay.
While you are at it-----search around some junkyards for a 73 Full size Mopar and get the disc brakes----spindles and all.
Direct bolt in---I did this to my 300 because replacing the the calipers and rotors, even back in the early 80s, was way too expensive and the parts were difficult to locate. Mine had those 4-piston calipers and 2-piece rotors.