Brakes:

I wanted disc brakes and a 4.5" bolt circle. The easiest way to do this was to go to the junk yard and get some parts from a '73 or newer A-body. You need the upper control arms - because the ball joint is larger, and spindle assemblies - everything between the upper and lower control arms.

Swap the parts, get an alignment, and you're done. In my case, I didn't have any problems with the proportioning valve, but you never know. I don't like bad brakes or bad tires, so I went with new ball joints, rebuilt calipers, new brake shoes, hoses, etc.

The rear of the car was another story. I had an 8-3/4" A-body rear with 4" bolt circle and the little 9" brakes. I didn't want to carry two spare tires, or re-drill the flanges of the axles because the holes would have been very close to the edge of the flange. So, I got new axles made. Mine were Summers Brothers, but today they would probably be Moser. Then I took another trip to the junk yard, where I got a pair of 11" brakes from the back of a BIG Chrysler of some sort. This was not the smartest move - Too much braking in the rear. I should have picked up the more common 10" brakes. Oh well... next time, maybe I'll go that route.