From the cooling fan wiring, sub and amp, exhaust (under the rear end?) installations just to start with, maybe he decided it’s time to cut bait and get out from under it. Either the speedometer's been changed or maybe it started out as a column shift. The seats and Chevelle door panels still work with the car, but I’d part with that chrome dash. Maybe he bought it from a minimal amount of photos, without actually seeing it in person.