Seats/Seat belts for daily driver

If you'll have a seatbelt across your chest, you'll need a seat with latching back. That belt would hurt you a lot more if the weight of seat back went forward with you in a collision. 68 model got shoulder belts and manually operated latches on the hinged seat backs. Your 67 may not have a anchor for a shoulder belt behind the headliner. More likely to have a coat hook in that location.