73 Dart Torsion Bar Fiasco!

Hello, I have removed and replaced the torsion bar 3 times already. I had to install new LCA bushings. I jacked the car up and placed it on blocks and let the tires hang so that there was no load on the torsion bars. I reinstalled the bars and tightened up the adjustment bolt. At first the car rested at ride height but after taking it for a test drive it dropped down to almost bottoming out. I tightened up the torsion bar adjusting bolt and it still drops down. Can someone help me with how to install the torsion bar.