I would level the chassis left to right and unload the bulk of suspension and engine weight, with more stands.
support the chassis at eight points. front crossmember, rear crossmember and at the forward section of the chassis and the rear.
The chassis is the foundation of the suspension , Subframe connectors and Torque boxes are to beef up the foundation.
If you Chassis or Unibody is under load from the suspension it may not be true and square, Losts of Mopars rubnning around with bad rear leafs and misadjusted torsion bars.

While your under thee gusset your steering box with a little triangular piece of heavy gauge, and if your up to it add the reinforcing plate to the underside of your LCA (Mancni , Firm Feel)

Ron