I recently purchased a 67 326 HO bird. With the bird came copies of all the original papers, including the name of the woman who bought the car new. She recently passed away, but I've been in contact with her brother, He told me that about a year after she bought the car there was a main seal leak and she brought the car back to the dealer for service, and it was then that the dealer told her that her motor was a 350.(which wasn't even offered until 68) Apparently the plant put a 350 in the car, I have a 350 in my car. Is it the original? How would I know? So I took the car to the local Pontiac nut and he said there is no way of knowing. So I sent away for my car packet through PHS, which turned up empty, because they think I have a 326. Which according to my VIN and cowl plate I do. Now what do I do?How can tell.