code

Hi... I have been looking for over a year. Any advice where I might locate matching 1967 manufactured 670 heads with D, E or early F codes? Thank you.

There are some 670 heads with date code M216. I have read that the first letter is the month, then 2-digit for day, and last digit is year. However, M=13 and of course there aren't 13 months. Can someone explain this date code? Thanks.

Does anyone know why the cowl tag on my 1960 Bonneville Convertible says "66" for trim? https://www.dropbox.com/s/x2j27dwkhalvxmj/tag.jpg?dl=0 All the trim codes for this year are 3 digits and they all start with 2. I read somewhere that someone who had a trim code that was 68 was "short" for...