He is best known for winning the NASCAR Rookie of the Year award in 1964. Cooper made his Grand National debut in 1963 at South Boston Speedway, starting and finish in last place in the 22-car field after a head gasket failure on the opening lap.
He tied his career-best finish of 3rd place at Piedmont Interstate Fairgrounds that season.
He ended that season ranked 21st in the standings after competing in 39 of 62 races and was named the NASCAR Rookie of the Year for 1964. Cooper would compete regularly on the Grand National circuit for the next three seasons following his 1964 Rookie of the Year campaign, finishing a career high 19th in the standings in 1965.
[3] Having competed for his own team for much of his career, Cooper ran eight races for two-time Grand National champion Buck Baker in 1967, posting a best finish of 8th place at Asheville-Weaverville Speedway.
[4] He would compete in just one race in 1968, driving for owner/driver Henley Gray at Bristol Motor Speedway, finishing in 27th place after a ball joint failure just 206 laps into the 500-lap event.