This was an interesting video if a bit long. A 50 Ford that appears to have the police equipped "law enforcement engine" which is the Mercury 255. According to my research that equipment was not available to civilians and yet documentation with the car indicates it was a civilian car. Very well preserved. Got the rare dual exhaust option too.
https://youtu.be/Z3KGSrs5L2Q?si=wKDpyTFtbT5AorZb