8 3/4 rear in 65 Signet

8 3/4 rear parts you will need: shock plates, u-bolts, shortened drive shaft.
Use the brakes from the rear too. The 741 rear will be fine, I have one on my 1974 Satellite with a 340 engine, my buddy also has one on his 1970 Coronet with a 440. Your rear probably has the small joint size, that will also be fine. If it has the larger size, you can get a joint with both sized ends so you won't have to change the yoke. I would recommend heavier duty leafs, or maybe just have them add a leaf and have them re-sprung or arched. Your old brake lines and shocks should work too. Good luck!