I've recently purchased a 1973 Z/28. The previous owner had the car since 1977. It is a #3 condition survivor car, that was re-painted in in 1978 to repair corrosion (new panels, fenders and doors), and used as a Sunday driver for the next 40 years. It does not have a Chin Spoiler. When I asked the previous owner about it, he said he doesn't remember the car ever having one. Is this possible?