[TimG]

The more high performance and rare the vehicle, the more important the paperwork.
A 250 horse 1965 Corvette has more value with the original driveline than with the original paperwork. A L89 Camaro convertible world get more value out of having the original window sticker than the original engine where as a Camaro SS 350 would have more value with its original engine than a window sticker. These are just my feelings, but the rare, high dollar cars are faked and stamped. If it has a real window sticker, it is probably what it is even if the engine is a restamp.