[Jeff H]

The original engine might not be as big a deal on a 67 Camaro or 69 Camaro with X codes or build sheet because that information helps verify the car. But on cars like early 69's and 68 Camaros, the original engine/trans/rear might be the only way to verify the car is what it's claimed to be. A 1968 Z28 without the original engine is pretty much just another 1968 Camaro unless you have paperwork. But we all know that a lot of cars have suddenly had paperwork appear too!