you can calculate the distance back from reverse engineering the drawings from the center line of the rear upright, threw the rear wishbones onto the chassis pickups as for the height i would not be determined to keep the book angles basically in the ideal world at neural ride height under no load the drive shafts want to be angled down slightly from the diff to the wheels this allows them to become straight under acceleration as the suspension squats.
a little more info may help, what diff and shafts are you planning on using?
tilly
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