Racing at Southport Airport, Apple Valley, MN.
Below is an excerpt about SCCA racing at Southport in the 1960s, from EAA Chapter 25, Minneapolis/St. Paul, MN newsletter (June 2006) called, "Southport Airport, A TimeForgotten" by Noel Allard.
The Sports Car Club of America, Land-O-Lakes Chapter, staged annual sports car races at the field from 1963 through 1968 using the runway and taxiways. In 1969 the races at Southport were discontinued and moved to the newly completed Donnybrooke racetrack at Brainerd. I attended the Southport races and one year watched them while orbiting overhead in a Cessna 150 belonging to the Cloud 7 Flying Club out of Flying Cloud Airport. Forrest Lovley flew overhead one year and when he wanted to land, chose a break in the races and landed, catching hell from the organizers. Scotty Beckett, the winner of the 1963 race, told me that the racing arrangements were handled between the club and Chuck Doyle.
This film is dated 1968 and has the Formula A Formula 5000 race that took place in September 22, 1968. 1968 is the only year Formula B raced with Formula A.