V-Drives are pretty old. Speedboats were using them back in the 50's. As far as pictures, the best I can do is a page with a 1969 Century Arabians on it: http://www.classicboating.com/sold_boats.html
I remember Sanger was using Walter V-Drives in many of their boats in the sixties and seventies as were other performance boat builders. As far as V- Drives in tournament boats, George may be right, I don't remember seeing them in tourney boats until the late 80s, early 90's. Centurion, MC Maristar, CC Super Sport, and Sanger V-210 were among the ones I saw most in California, there may have been others out there as well.