Torsion Bar ajustment for front height of a 69 Dart!

Hi, I wanted to lower my 69 Dart swinger front end,
Right now it Sit's the same level as the rear!
Does anyone know how many turns you turn the torsion bar
To lower ..... EXAMPLE! 1-inch one turn, or 1-inch two turns to lower
or raise the front !
Would greatly appreciate some details on this!
Thank you Sonny