First drive after brake upgrade, then - BANG!

So, I put '73+ disk brakes and a QA1 UCA onto my '69 Barracuda and went for a test drive. The car is new to me, and hasn't been registered since '84 - it's a solid car w no real rust issues. All of a sudden, while driving down the road - I hear a LOUD bang from where the torsion bar is mounted under the passenger's seat (solid/no rust). Now, the car sits about 2" lower on the front passenger's side and the frame is sitting on the LCA bump-stop. Torsion bars seem to have been replaced recently (I suspect the guy who sold it to me had some suspension work done to it) and nothing appears broken.
1) Could the torsion bar have turned inside the mounting box?
2) if so, do I need to remove the torsion bar to rotate it back to correct ride height?