I'm a little late to the conversation but here's my #'s but with 3" of foam

( 1" too much foam, which I may remove if I get it upholstered)
I had to weld up broken springs & all the cushion was gone so I was just guessing.

Keep in mind I'm skinny & short so this set up works for me.
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1959 3100, original 235/3 on the tree w/overdrive. Carter YF 2100S carb, 205/75/15 w/front sway bar