Front Tires Are Wearing Prematurely

I don’t want to sound like a wise ***, but a competent Mopar front end alignment technician should be able to figure out what is ailing your front end in about two seconds.

I suspect that your torsion bars have fatigued, and no longer can support the car properly. Slant six bars, 0.081” were barely strong enough to support the car when new, and compared to modern a car’s spring rate are a flopping mess. That is why the car won’t settle to the same ride height after bouncing per front end alignment procedure.

If you haven’t yet, I would refresh your front end’s bushings, replace any worn parts, and install stiffer torsion bars close to one inch diameter. I’m running Firm Feel 0.940” bars on my 67 slant six rag top, and they are not stiff at all.