​This car was built for car owner’s Tim Delrose and Dale Holt by Grant King in 1979. 

   
   It was driven primarily by Gary Bettenhausen from 1979 through 1986 and on at least one occasion by A.J. Foyt. Bettenhausen won a pair of USAC Silver Crown titles with this car, in 1980 and 1983. ​​Gary was a consistent winner with the Delrose-Holt no. 1, with four victories at DuQuoin, Illinois, and single wins at the Hoosier Hundred (Indianapolis), Terre Haute, Indiana, Nazareth, Pennsylvania and Springfield, Illinois.
 
   A.J. Foyt also drove the car on at least one occasion, at the 1982 Hoosier Hundred, finishing 19th.