Looking to buy a 67-72

[SRH916]

Hi, I'm usually on the 73-87 board, but I have been noticing a lot of 67-72's around my area for sale. I have always wanted one, but have never been sure what to look for. What should I keep my eye out for? Any rust notorious in certain areas? Rare options? And how can I tell the difference between years? I know that the 67's have no side markers, but what are the other differences? I just need some general tips and knowledge of what to look for when I end up looking to add one of these trucks to my collection.

Thanks for all the help,
Jared