No ground would come from fuse panel...Are you sure someone didn't just add that wire by unwrapping original harness and re-wrapping it, looking like an original factory?
Maybe used a 12v source for an HEI they had on...
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1969 GTO 400-4speed, H/T
1969 GTO 400-RAIII-4speed, Convertible
1969 Grand Prix SJ
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