Front Disc Brakes
I have done 3 kinds of brake upgrades for the front of A bodies. I have put 73 - 76 disc on the front of the Scamp, to get 4.5 pattern, worked well. I put small pattern SSBC kit on the Demon to keep 4' BP. This kit is very good for the money and has both bolt patterns in it, and stops great. On my 65 Cuds I have Wilwood brakes that go on the 10 drum spindles. This kit is expensive but I bought it from someone who didn't finish his project for a deal. It has aluminium hubs and looks great (haven't driven it yet). Both after market kits are easy to put together. I haven't had to buy any extra parts yet so that I can't tell you about.
The 2 pics are of disc kit for the Cuda, and a p[ic of the disc's on the Demon