The problem with all this numbers matching stuff is that guys with deep pockets will pay up for these cars even though most are certainly faked! The price difference is too great on a numbers matching car and a non original engine car. I think that as long as a car had a 427 engine from new and has the engine replaced that should have some merit! I myself would love to have a 67 vette with the 427 and I really would not care to much if it had the wrong engine as long as the price was in line with the car! Fred