LCA repair options...

You have ones with the sway bar tabs on them? Guys sell those for $250 and get it all day long.

I'd just grind the weld off on one side of the stiffening plate, clamp the LCA to get the tolerance the way you want it and re-weld.

Or, you can take it a step further and weld gussets onto the LCA. Just make sure the torsion bar lever clears them through its full range of motion. :D