1968 Baracuda Convertible - trunk lip stamping numbers

1st digit may be a "P" not B.
Do the digits match the last ones in vin? I believe they should.
5th digit if its "P" it's a formula s car.
got a chance to uncover these today and am wondering what they could tell me - read some conflicting stuff on (VON/SON)- anyone know what these numbers relate to or a source to decode? they do not seem to match directly to the VIN - I have no fender tag. It reads:B8B276591