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

View attachment 1715281428
Mancini racing has 1" drop front brackets or you can use a block to lower it by raising the axle.