Torsion bars and lower control arm set-up

Ride height is all personal preference, imo. I finally you want it set to exactly factory height, I think 72blu has a picture showing how that's done. I prefer my cars lower than ride height so I just set it to where I like the look and go with it. Mine is 25.5" from the ground to the highest part of the wheel well lip
I try to center them between the jounce and rebound bumpers. If you lower it too close to the bumper, it can put a bind on the control arm travel, it will ride like crap and you just might break something. Years ago, I bought a repo Dustpan. The PO was a huge fan of the snow plow look. It was riding on the lower control arm bumpers, and had cracked the upper control arm frame ears, among other damage.