1965 drum/front end and rear end worth the swap to 1964?

The big ball joint in the adjustable upper control arms won't fit the 65 spindles. The 73 and up disc brake set up from an A body will fit the big ball joint control arms, as that's what they came with anyway. If you swap to that brake set up, it will give the big bolt pattern also, and you will need new wheels. You could swap in a big bolt pattern 8 1/4 rearend also, in order to have the same bolt pattern on the wheels front and back.