Depends on what you consider rare. I believe there are a couple of 67-68 Z28 cars, two COPO 9561, and two or three JL8 Camaros. One of them being an SS350, not a Z28, and not a fake.
A former friend of mine used to own an Antwerp built -71 with a special 409 hp angle plug head LT1. It was turned into a racecar.
Anders