I remember reading about this when they had just completed the prototype, and it was going to go into a very limited production. I thought they had made something like 300 of these, but I guess the project never went through. Here are some details on the project:

Richard Petty 50th Anniversary Pontiac Grand Prix Concept Car

I like how it looks, but the only thing that really stands out to me are the seats. Those DEFINITELY should have been the gen 7 GP seats, as opposed to the garbage seats they used on our cars.