Torsion Bar Advice / Discount Codes Needed

I spoke with John at PST and was told their bars
would drop the ride height 1/2 to 1in due to the
way their bars are clocked.
I already am hanging pretty lower with the headers and pan.
I do not know the correct ride height to begin with, does anyone
have that info available and where to measure from to get the
correct figures?
As it stands its 26in to the center lip of the front fender, 4in floor to oil pan.