I have a 65 FB also. Let's start with the deck lid and torsion bar. Then let me know what help you need with the bumpers.
Installing the deck lid is mostly trial and error. Also helps if you have a friend to assist. Begin by bolting the deck lid onto the hinge assembly (pic 0718). Snug the bolts down but not so tight that the deck lid won't move left to right or forward and rearward. Make your adjustments a little at a time. The object is to get the gaps as even as possible on all sides. Just get as close as you can because you'll come back later for final adjustment. Now go to the hinge assembly. You can adjust the height of the deck lid (pic 0729). Again, snug the bolts so the hinge assemble will move up and down. More trial and error. Make your adjustments a little at a time until you get the height of the deck lid flush with the rear quarters and back deck. Once your satisfied with the height, go back to the deck lid bolts and make any final adjustments until your satisfied with the way it looks.
Now for the torsion bar. Thread it through the right hinge first and then back it up so the square end goes through the left hinge (pic 719). Now take some vice grips or channel locks and twist the bar until you can get the end through the bracket on the right hinge. Careful here. That torsion bar has a lot of force. Once you get it through the bracket, cap it off with a speed nut (I used 2) or some type of fastener that will allow the bar to turn but not come off the bracket. Lube the bar with some white lithium grease to reduce friction (pic 725). Your deck lid should now stay open by itself. Now for the center bracket. Take a piece of rubber tubing, slice it length wise and slip it on the torsion bar. Now take your bracket and secure it to the 2 holes in the center of your deck lid . That should do it.
Hope this helps. Good Luck!