These questions have been answered a gazillion times, so search first.
You only need the UCA's from a later car. LCA's are generally the same, with exception that if someone wants factory sway bars in a 66- car, you must use early LCA's w/ tabs.
In general, front disks are slightly lighter than drums, but probably a wash in this case. The main concern is balancing front & rear braking, which requires a "proportioning valve". Best and cheapest is an adjustable one. Set it so the fronts skid slightly sooner on wet pavement.