Dana 60

The Good Doctor is a Strange dealer. Get a Strange with Big Ford ends. More brake kit options with the Torino style housing ends.
Have the perches put on at 1” less than stock perch to perch if you want to fit bigger tires and wheels by doing the Doctor Diff offset spring shackles and hangers. Also, I would suggest searching the forum for the 68-70 B-body rear axle swap to see if you would want to do that B-body width on the Dana.