Strange things happen when the 43-year-old ignition switch contacts wear. Just be very sure that noise is NOT the starter solenoid trying to reactivate! By removing the rear upholstery panel, then the steel firewall access panel and trying your key, the noise location should be immediately obvious.
The Pantera was built as a basic supercar; there are no stock electrical protection circuits in the whole machine, but previous owners may have done about anything imaginable in the wiring.
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