I have a 1967 coupe barracuda with a low serial number and shipped march 1966.

the car was sandblasted and repainted black approx 40 years ago. Car was a 273 2 barrel and was assigned a high value on the vin. I have other pieces and have partially restored it using a 68 318.

How long have you had the car? Did the person who sold you the car provide any evidence to the Petty connection? A lot of tales can be told about something that is 53 years old.