Torsion bar Warning

How many miles do you have on those T-bars California Dart?

The amount of adjustment left in the adjusting screws will not change the rate or impact forces than the rear mounts sees. One thing that would if the car was too low and it was bottoming out. It doesn't seem from your pictures that the front end was dropped and there should be plenty of clearance between Lower Control Arm and frame.

I've got 80,000 miles from 1994 to 2010 with .99 T-bars on my 68 Barracuda. Then I've got about 3,000 miles on my 1.14" T-bar that are about 50% more rate than the .99" bars (little less than 3 times stock). I don't have rear reinforcing plates.