Dating previous owner's disc conversion

Good question. I'll check on that when I get into it this weekend. Switching the spindles would be a good opportunity to change out all the bushings and any bad ball joints. Is there any braking disadvantage to having them on the back side of the wheel as opposed to the front?

The bleeder valve would stay on top, I think.
No difference in stopping. Upper and lower arms, ball joints, etc.. stay where they are now.