Just eyeball it, the body and frame vary enough that precise measurements aren't very helpful in finding L/R "level".

And there is no particular rotational orientation for the torsion bar to be in, any marks on there can be used for reference if desired but aren't significant to function.

IIRC the stamped end that marks L or R goes to the rear...

Steve Carlson - 95 Trooper LS expo rig
Serenity now!