Unless you have a proper cage and significant reinforcement to support the chassis, I would stick with 1.06 or lower for A bodies and 1.10 or lower for the B and E's. Any more than that and significant torsional load is transferred to the chassis; you begin to pop spot welds and tear sheet metal.
My Duster has broken these while using mopar 1.14 bars: k-member at control arm/torsion bar pivot, torsion bar cross member at torsion bar socket. A bodies are flimsy so get out the welder. Get some custom rate leafs to match large bars or it's Plow city. For me, I like the .99 bars addco front and rear sway bars, monroe shocks, and Hotchkiss 130lb leafs for driving my Duster. My stock suspension factory bars and leafs Duster with just low profile tires, front and rear sway bars and edelbrock shocks handled like a boat, when autocrossing in comparison.
For me, I like the .99 bars addco front and rear sway bars, monroe shocks, and Hotchkiss 130lb leafs for driving my Duster. My stock suspension factory bars and leafs Duster with just low profile tires, front and rear sway bars and edelbrock shocks handled like a boat, when autocrossing in comparison. 
