Dont you hate it when...

I learned from experience that options and part #'s go in either year direction by 1. Sometimes more. They would throw early parts into the next year model to use them up. So sometimes you get some weird stuff. Hence my 77ferd MustII factory 302 with 1970 flattop pistons. And the motor was never apart before I got it. Never be surprised when you see something weird on a car, especially if it's a factory part from either the year before or after your model year.