HELP! I'm running out of ideas

No the car wasn't original when I bought it. Like I mentioned in my earlier post, it is a 67 barracuda with a 74+ disc brake conversion (larger upper balljoints). The previous owner must have made the changes to it because I also noticed it has torsion bars that are meant for a 383 car (0.89" I believe) and it had the larger 1.25" pitman shaft in the power steering box (not sure if that was stock for 67) so I wouldn't be surprised if they changed over most of the K-member when they did the conversion. I've driven it like that for years without issues.

When I lifted it up last night and felt for play I did feel a very little bit of movement when I press and pull at 6 - 12 o'clock positions.

I've taken the discs off and will be replacing all bearings and races (cheap insurance). This must be the issue, it really felt like the rim was loose on the spindle (bearing not making proper constant contact.)

I also checked the back of the disc for evidence of it not seating properly but the studs are no where near the contact surface.