NEW: S/S Hemi Prototype Barracuda (Mule) Info found ! Magazine Test car connection!
I found that old FABO on the Pilot 67 Valiant Signet. It has an early SPD of 807 and SO number 30019. Car was used in parts book I believe.
I've learned SO number meaning very year for year. So what might mean something in 1968 does not apply to other years typically.