SEA OF LOVE; Chevrolet's Corvette 50th Anniversary Celebration washes over Nashville.

Byline: MAC MORRISON Sports car racer Andy Pilgrim shakes his head. He looks a mixture of bewildered and overwhelmed, as if he can't believe what he finds himself party to. "I've spent three nonstop hours signing autographs,'' the factory Corvette C5-R driver says, his tone filled with both amazement and humility. "It just shows the impact the race program has on Corvette owners. I mean, three hours... it's bizarre, man.'' We know what he means. Early in the day, we're bobbing in a sea of enthusiast love as Chevrolet's Official Corvette 50th Anniversary Celebration ...