Between the 67 only dash and the 68-9 versions, the only differences I know for sure is the way the heater control system mounts, the 2 post radio area as opposed to the thumbwheel, the screw in style speedo cable, the door latch on the glovebox, and the dash housing does not have the collision impact cutouts that the later dashes have! The dashpad from 67 has a raised crease along it, whereas the 68 and up doesn't! Not sure about 70 and up, these are the differences between 67 only and 68-9 dashes!
