8 3/4 Brake drum face to leaf spring measurement needed.

My '71 Dart GT has the factory installed 8 3/4" rear-end with stock location leaf springs.

Does anyone have a measurement from the (10" X 1 3"4) brake drum's face to the outboard side of the leaf spring?

I'm trying to see where different wheel backspaces will place a wheel in relation to the leaf spring(s).