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

Core support stamping
7242402016
7-1967
2-Hamtramck
424-April 24 1967
02016 shipping order
This stamping agrees with the data plate.

Alan
Does not prove that Richard Petty did not order the car under discussion. The car was built to a sales order number, it had to be someone’s order, it may have been The King’s. Although I think it was Elvis’s.