66 looks like this (it LOOKS alot alike, but strangely very very different) in the front
notice the header panel wraps all the way around the grills, as opposed to the 67 that doesn't and only is above hte grills (top is 66 below is of course my 67)

66 also has completely different lines on the ass, and different tail panels and taillights (i really like the 66 rear a little more then the 67 but i'm not sweatin it) first the 66, then my 67 for comparison