How much clearance do you have before hitting the bump stops on your lower arms?
There's a factory procedure and height laid out in the service manual, which would be the "correct" way to do it for stock cars.
Keep in mind that "stock" here doesn't just mean stock torsion bars, it also means stock tire size, at least height wise. It also means stock alignment figures, because the suspension geometry changes with ride height. Sure, you can adjust the suspension once the height is set, but some of the geometry is based on that height (control arm angles, roll center, etc).
Here's the procedure for adjusting the height. Obviously its part of doing an alignment in the manual, but the factory specs for alignment are for bias plys, and should NOT be used on anything that runs radial tires. Which is why I didn't post it. For that matter, all of the geometry called for by the factory is based on those crappy tires. So, I would take the specs called for by the factory with a grain of salt. They mean next to nothing if you're running different sized radial tires, and ABSOLUTELY nothing if you're running larger torsion bars and adjusting the geometry for road handling. The factory specs and parts set the car up for significant understeer, which is not what most performance minded folks will want. There's a lot more to setting the height than just "will it hit the bump stops".
