It's said in a number of publications that the nose was changed in 1965. It was owned then by Dan Margulies and David Piper, renowned for modifying cars, raced the car a couple of times in DM's ownership so perhaps he had something to do with the nose change? However, Anthony Pritchard said in his GTO book that the rectangular spotlights in the nose were removed and replaced with vertical brake cooling slots in 1965, probably before Corrado Ferlaino, who owned 3413GT between December, 1963 to 1965, sold the car. Perhaps the nose has been kept as is because the brake cooling slots are useful? Mind you the narrower radiator grille opening looks less effective for engine cooling? It was Corrado Ferlaino that arranged for the car to be rebodied by Scaglietti when he acquired the car.