Thunder in Carolina
I first saw this movie as a kid (1961 or 62) in a double feature with "The Green Helmet". I have been a life-long racing fan, and I spent quite a bit of time trying to find this movie on video, ultimately getting a slightly used VHS with the alternate title "Hard Drivin'".
The plot of this movie was re-used in a 1968 movie called "Fever Heat" (which is also available on video).
"Thunder in Carolina" is available on VHS and DVD from www.thevideobeat.com for about $25.