Both of my Banshee frames that have had 3 different brand arms, including stock, measure 8 1/2" top and 9 1/2" bottom between the mount ears on the frame.
This had wires (all but a few, 2 or 3) broken inside the insulation. Undetectable until they completely broke.
Although I've ran across it before on GM HEI distributor harnesses and if you feel every mm you can feel the soft spot.
Wiring harness, I've seen one ohm test good, but in this case had the wires from the pickup coil actually down to few strands. It ran fine but would fall on it's face and stutter when the RPM climbed.