Hey Ryan,welcome to the truck board(by way of Suburban board
).That`ll be a great start for you.You`ve been given a couple ways to tell if it`s an actual`67.They had a few carry-over piecesfrom the previous design:wing vent latches and seat belt are two first give-aways.The dash has different ignition switch...not as deep/more flush,lighter socket,too.The interior mirror has a squared arm and the ash tray has a thinner ridge around the outer edge.As mentioned,the large or Panoramic rear glass would be a deluxe cab with chromed wing vent frames/channels and stainless trim in windshiels/back glass gaskets...this could all be swapped out,though.It could be a`68 with a`67 build date.An early`68 could have been wrongly titled as a`67 by the state from day#1.Filling the marker lights or finding`67 fenders would be a simple way to create a`67 look,though.