Based on this pictures this looks to me like some "slotted" the suspension.
This one is the real key
If you look you can see the plates moded the arm to sit lower in the torsion bar moun. The round flange and the round control arm are now not lined up.
I am still trying to understand what this would achieve, but I can tell you right now I would consider that illegal. You can clearly see someone intentionally hacked up the mount and move the position control arm relative to the body for some reason. One can only assume it was to improve something.
My recommendation is to replace the t-bar carrier. If you get to nationals like that and we check for bushings this will likely stand out. You could try to weld plate there to corret it, but it will invite more questions. It does not appear you are fixing some "wear" surface. So that may be hard to answer and prove your case.
Truthfully I had I found this at impound I would have been quite upset. Now given the circumstances of this being new car to you built by someone else and you bring this out in the open I would give some lattitude. However since you have not run any Az events I don't feel I can make call as to what or if a penalty should be applied. That will be Tim Comeau's call being the So-cal regional director.