I have one more guess...could J be Robert Bourke, designer of the 1953 Studebaker Starlight in # 2? I remembered that there was a team of 3 designers who were actively involved in the design of the '49 Ford and the '53 Studebaker, and that there was controversy over just who actually was responsible for the original design of the Ford. The credit goes to Caleal, but both Koto and Bourke challenged it. Evidently, the car might have orginally been intended to be a Studebaker...
Caleal was the only one of the three men I could find a picture of, and it was the same one that you posted, Ray. So, I'm guessing on Bourke...
Dan