Good morning, Joe~
LIDCA featured a retrospective on the US Nationals several years ago. That's where I took the narrative from. We had many former winning birds at the Show (including a couple of mine from the 1990s), but I do not know of a list per se. I'll look around next week when I have more time.
It was a great event in its day. I recall standing shoulder-to-shoulder with the crowd, edging slowly around the floor to see all of the fine birds.
All the best,
SJS