Found some footage from 1964 on an episode of "Voyage To The Bottom Of The Sea" on HULU.com. The episode is titled "Time Bomb" and the racing scenes start around the 30 min. mark. Some of the hydros are Miss Exide, Mariner Too, The 4-seat Tempo, 1964 Miss Budweiser, Savair's Mist and the Miss Madison. The episode is stupid but the racing footage is pretty good. Take a look.