I think it may be the 1977 nationals. There is a trailer in the picture which I think belonged to Siebert Olds. As I remember it was the first time some one brought a sprint car in a major enclosed trailer. Eddie Leavitt drove the Siebert #9 at the nationals. The car next to Kenny is the #40 R&H Farms car. I think this 40 car was new as the #40 that won the nationals was a Beck car.

Was the Marler car a former Pancho Carter car? I remember the 4 was sort of a robins egg blue color.