First drive after brake upgrade, then - BANG!

The bottom line is . You have a broken torsion bar if the car dropped and you have no weld breaks or rust issues . But you also have many more mechanical issues. Good luck
Not only a possible broken torsion bar but also the other side is about ready to break. They are left and rights, depending on the twists. Another possibility, looks like you may have a big block in a 6 cly or small block, torsion bar set up. Either way you may have a broken torsion bar, so check out the other side for correctness.