Front Suspension Confusion

I have a 68 Dart with the 340 k-frame from a 72 Duster. It has 73 disc brakes. The 68 ride height is 2 1/8", 72 height is 1 5/8", and 73 is 1 7/8". My new front wheels (cragar 15x6 -6mm offset) and tires (BFG 225/60-15) stick out too far. To keep them from rubbing, I raised the front with the torsion bars. When the local old school suspension guy did my alignment, he wasn't comfortable with the results. He told me to bring it back up to him if I lower the ride height. The car drifts sideways when driving it, so I want to get the height, caster, and camber right. The car also has all new front suspension parts (ball joints, tie rods, bushings etc..). I put some 185's on it and lowered the height. I'm going to take it back up to the guy and I would like to have it set at the right height. What is the correct height? Does the 73 disc set-up stick out further? I found some cragars with a +6mm offset. I don't think the 12mm difference is enough.