Hmmm...trying to think outside the box. Any chance you have two of the same side torsion bars?? Are they marked R and L?
When their out of the car, you can lay them on a bench, put the same end hexes 'flat' on the bench. The opposite ends will be slightly twisted, each one, opposite directions.
They are marked yes 784R and 785L....I could actually change the title of thread (if possible) to just "Ride Height Setting Issue"
I actually borrowed a pair of orig bars (.089"), just to rule out the possibility of defect with my new (2 yr old) Mopar Perf .096" bars
With the .089" bars, the issue is the same, much more thread required on lh adj bolt to come even close to level with rh (after moving car back and forth, the lh side remained 1" lower than right)
I even swapped in my old leaf springs to rule out anything there, and no change so put the mopar perf hd springs back in
I do notice that with bars on flat ground (both sets side by side), one end sits on flat of hex, and one end sits fairly straight up on a point, this was consistent with all four bars
I was able to get a clear photo of an orig crossmemnber from a 68 charger, and my sockets in the torsion bar crossmemeber appear to both be lined up correctly (points at 6 and 12), also confirmed this on a friends e body
One strange thing, I was able to get the bars to swap side to side easily, but didn't load them at all, only to test the movement in the sockets, which is where I'm focused on now
With correct bars in place (tried with both sets), the bars go in with adj blade just at the top of the little window in the arm that holds the adjuster block, then before putting bolts back in, I can push the RH adjuster blade up maybe 1/4" just taking up slack in bar sockets, but the LH side goes up further closer to 3/4". So it's looking to me like the socket in the adjuster blade must be worn somewhat allowing the extra movement. But my adjuster blade is already too high just pushing up with screwdriver, so with no load, I already have about 3/4" difference left to right
So at minimum I've ruled out the bars, and I know there is some built in space/slack in the sockets for ease of service, but with no load, my adjuster blade is up too far already
My next step (since I don't want tubular lower arms) is to post a WTB for a LH lca, it looks like I'll need to try one (even though it will be used), I'll have to hope to get lucky !
I'll keep updating
Thanks for inputs