Trying to decide on 5-leaf or 6-leaf Springs

Hi

I’m new around here and I have a question
I’m wanting to drop the butt on my 71 demon significantly and I’m looking at this post thinking I need a stock type 6 leaf espo
Spring pack

And a front torsion bar around a 1.06-1.08 In diameter.

Do any of you run this type of setup and if so what are your measurements from the ground to the center of the rear wheel well