torsion bar adjustment

I'd start with adjusters bolts about halfway in with those bars and then go from there.
Drive it up onto some 2x10s or very trusty ramps to set the ride height. Use the factory specs and measurement methods. Barracuda is 1.5" IIRC.

Good advice on taking the weight off. It will make it easier and why take a chance. For adjust down, not so much an issue. So go higher and lower it down when you make your final settings