Very good job young buck! Get your self the mutt 1968. The seatbelts retracters are a nightmare### that's if they didn't rust away to nothing they have covers that hold in the monster. I had a simular 74 454 vert and.l 75 l83 vert when I was your age. Much more refined then the one year wonder mutt 68. There are over 100 unique things to the car and revisions made along the years run. As far a your seat belts, pull them apart and paint he metal with something like and antitrust epoxy after glassbeedng the metal parts. It's a lot better then setting up a gold cadmium zinc dip and plating then etching. The look pretty, then a rusted and sized I 2 years. You may have to hunt donor springs down o buy them from the rebuilder. They are easy. The trick I to tighten and compress the plastics 5 or 6 times before setting them permanent. Kudos my friend