ball joint issues

FWIW, When I swapped from 9" drums to 73+ disk brakes I also rebuilt the front end and ordered lower ball joints for the 73 disk brake car. The only difference between the new Moog lower ball joint and the old 9" I took out was the size of the hole the bolt goes through to attach the spindle. The 73+ disk brake cars used a much larger bolt close to 3/4".

Also, all the articles I have read about doing this swap state if your lower ball joints are good to just drill out the ball joint to accept the larger bolt.