Camber has gone positive

Positive camber will wear the outside edges. And since the tires are now acting like couch-casters, the car will want to self-steer; which would for sure feel awful.
The LCA "slop" is in the fore and aft direction, and IMHO, means nothing on a streeter. The alignment locates the ball joints. The upper is firmly located by the triangulated UCA. The lower is located by triangulation of the strut rod, and the inner pivot of the LCA. If the inner pivot was able to move transversly it could move the BJ in and out, affecting camber. But moving longtitudinally, it would have to move a very,very, long way to affect the camber, and only because the strut rod locates a bit inboard of the BJ.
About the only way for the camber to go positive(barring movement of the UCA bushings), is if the UCA is moving outboard, or the LCA is moving inboard. While both of these movements are possible, the more likely is the LCA,via worn out bushings.
As for me, it would take an awful lot of convincing for me to take the time to tighten up the fore/aft clearance.
Keep in mind that as the suspension moves up and down, the BJ moves fore and aft, because of its tether to the front via the strut-rod. So if you changed the ride height after the alignment it's very possible that changed the caster. Depending on where the caster started from and which way it went, that could affect the camber either way, but it would not be much in any case.
If your tires are worn conical, they will steer badly with a new alignment.