T-bars vs Stored energy

Our 70 Dart has original /6 torsion bars
Drag car

Want to change the rate of rise, in the front
The / bars seem dead.

this winter
we are installing heim joint tubular A arms
to get smoother movement of the arm
wonder while it is apart
change the bars to New 340 bars
or a used set (340) bars

I'll get the #'s off the bars later, to see what exactly they are

guess, we really need to weigh the car, it would help

small block,alum heads, intake
727
Dana 60