bottoming out

I bought a 73 Dart for my 17 year old son last year. The thing would not even go over speed bump with out bottoming out. We figured it was the torsion bars and we were partly right. After we took the torsion bars out we found that the lower control arms bushings were waisted as well. They were so bad that the control arms were even ruined. After new control arms and bushings, and of course new torsion bars, the car is right again.