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Wow, some very rare and nice wheels there!
Is -20 stamped on the wheel? If it has 4 inches of lip and 4 inches of backspacing with a completely flat face that would be +0 offset. You mention a 1/2 inch for caliper clearance, so that would mean you roughly have -12s or 13s.
Not trying to take away from your thread, just trying to figure out how you got -20 out of it with those back spacing measurements. If you have one of those L shaped rulers that is large enough you can just put it on the part of the wheel where it bolts to the hub and measure from that point to the end of the wheel to get a more accurate back spacing measurement.
GL with the sale!
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