I got this motor as a loner while mine was getting fixed and ended up keeping it. It runs great but I need a few things for it now. The guy that gave it to me said he didnt know the year either and I cant find any numbers that look like model numbers on it. One mechanic told me it looks like a 75 or 76 but I cant go on just that. There are numbers on it but they are on engine parts and are all just numbers, no letters in the sequence. Is there any other way to tell what year it is exactly?