alignment #s

I think you mean you can see the camber. If the camber is that obvious perhaps the adjustment has slipped.Caster angle is the angle formed between a vertical line and an imaginary line drawn between the two balljoints, and is viewed from the side; ie beside the car. It cannot be seen with the wheel mounted, or off for that matter,because the lower Bj is buried behind the brake system.
As for self-centering; this is mostly a function of caster ,steering axis inclination (which A-bodies dont have nearly enough of), and scrub radius. It is often muted by new tight balljoints and/or tie rod ends and overtightened steering arms. A too-tight sector shaft adjustment or any tightness in the steering box will also mute it.
I stuck with the factory box because, supposedly, it has a reduced ratio when on-center . When I rebuilt it I put 2 extra reaction discs into it though, to provide less assistance from the pump and better road manners.
Oh I see you have tubular upper arms, which probably wouldnt slip. Also remember not to jack the T-bars around after the alignment as that changes everything. Some things a lot, others only a little. Camber moves the most, then toe, caster very little. I have wonder if your alignment tech could have done a better job