A Treasure Trove of Reader Footage of 1950s & 60s Races

Rudi Markl wrote in with this wonderful film compiling his old 8mm film cans chronicling visits to venerable races across the Eastern half of the country between 1957 and 1967. Spectacular stuff.
Represented among this film is footage from a variety of East Coast races, including:
1957 & 1958 Kentucky State Fairgrounds (Louisville)
1964 Watkins Glen U.S. Grand Prix
1964 Vineland, NJ
1964 Lime Rock, CT
1965 Bridgehampton, NY
1966 Lime Rock
1967 Bridgehampton
Plus bonus footage from the 1968 Dutch Grand Prix!
Cobra fans be sure to check out the segment of the 1964 Vineland race. Fantastic moments in the pits with those smart looking Cobra team jackets.
Like all great collection of racing footage, this one also comes with a mystery. Rudi asks: “I’d love to know about the quick dark blue car in the Vineland, NJ races at 10:00, 10:36 and 11:52 (ed: I believe he’s referring to car #44 with those trumpets sticking out the bonnet). No hood, stubby rear and wide front fenders that slope inward (unlike any car I know of). Last year I spent a couple hours online trying to find it on old films. I did find some history and old racing footage from the Vineland track (which I only went to that one time), but none of that car. It must be a ‘special.’ Someone out there must know who built and drove it. I’m 79, but if I knew where it is now I’d be interested in buying it.”
Anyone know anything about this car, who built her, or where she might be today? Let’s hear about it in the comments!