Just watched this film from 1956. "Hot Cars" http://www.imdb.com/title/tt0049334/ Although it was a low budget film, it's really pretty good. Has a lot of on location filming, featuring a couple of actual used car lots in Culver City California. Big John's Used Cars, and Johnny O'Toole's Used Cars. Don't really see any hot rods or customs, though.....Just stockers from that era. However, all of the background locations are really cool to see. It's even available on DVD.