Dick Harrell and Fred Gibb were drag racing together in 1968 and wanted a car to compete in the auto trans class. NHRA rules called for 50 car minimum factory built so they ordered 50 COPO 9738 SS L78 Novas.
Some of them were converted to SS 427 Novas by Harrell.
The 1967 and 68 Yenko 427 Super Camaros were AHRA certified legal drag cars but NHRA would not accept the 427 Yenkos as factory built until the 1969 COPO 9561 were used.
Yenko was a certified manufacturer by FIA and SCCA for the Yenko Stinger project so AHRA acceped them with a 50 car minimum but NHRA didn't.