I have a friend who is flying out to Oklahoma next week to look at a car for sale. It is a '67 Camaro SS big block 4-speed convertible. It has a '69 396 in it, and he knows it is NOT numbers matching. His concern is... how does he tell if the car ORIGINALLY was a big block car to begin with from the factory? I am trying to get the VIN and maybe a pic of the cowl tag. But is there a list of things he can look at straight away to distinguish?... Danny