On a flat and level surface, preferably smooth, use the highest point of the front wheel well arch as your reference point. There could/should be a slight difference between the two front sides allowing for the crown of the road. So make note of the measurement for BOTH sides BEFORE making any adjustments. Also, mark on the fenderwell, where you made the mesurement so you can go back to that reference point and make note to which side of the mark you placed the measuring device. Mark your set nut on the torsion bar, that way you can count rotations. It has been figured, approximately 8 rotations = 1". Do 1" at a time, alternating side until you have it where you want it. After you have made the adjustment, take you baby out for a short drive hopefully with some good compression dips to allow the front end to settle. Go back and check your measurements and adjust as necessary.
After you are all done, make sure to have an alignment done to correct for the changes you have made.