info on old Alfa Romeo Duetto Race Car

Hi. I'm trying to locate my dad's old Duetto. My dad, Glen Shepard, raced this car in the MidDiv from about 1970 to 1976. He competed with the car at various tracks including MAR, Hutchinson, Ponca City, Lake Afton and Road Atlanta for the Run Offs in 1971. The car was painted orange with a black stripe down each side and was usually #98 or #93. He eventually sold the car to someone in the Kansas City area and Bob Haig was an area mechanic who wrenched on the car for a time. This car has has some good racing history going back to the original owner, Bob Griffith, of the Riverside California area. Bob raced his car with a buddy who owned an identical Duetto. I have been able to track that car down and want to know what happened to the car my dad raced. Has anyone seen a car like this at area vintage races? Looking for the Alfa, or for any ideas on how I might enhance my search.