I had a 67 barracuda i took drum brake off of that had the bid bolt pattern and the upper ball joint measures for a 1 13/16 socket . Its bigger that 1 3/4 and smaller than 1 7/8 ths. I don't know what's going on
are you using a standard socket to measure this or the specialized ball joint sockets?
ETA: the big joint is 1-59/64" the ball joint tool is 1 7/8" square, the small joint is 1.809 or a RCH over 1-3/4 at 1-26/32 or something, but again it's not a standard drive.