Making your '64 to '72 A body stop better is a fairly simpleproject, and there are several ways to accomplish the task. Front diskbrakes and dual master cylinder are the best bang for the buck mods you cando to a drum brake equipped car!
The easiest swap is to take the spindle and brake parts from a '69-'72 A orG body. It is a direct bolt in conversion on any drum brake car. You must also get the proportioning valve and master cylinder from the doner car, as well as the hard lines and hoses. I would replace all of the lines and hoses at this time. Pre bent replacement lines are available in both steel and stainless steel. Remember when ordering brake lines what rear you have in your car.
To further improve handling, heavier duty springs, good shocks, polygraphite bushings and sway bars are all good ways to eliminate dragging the doorhandles in tight turns! Use a 1.25" sway bar from a '78 TA, with new Polygraphite bushings and end links up front, and a N.O.S. 7/8" GM sway bar out back with boxed lower control arms.
The control arm bushings are all Energy Suspension polygraphite, as are the body bushings.
For steering box use this setup.
A) Monte Carlo SS Steering Box.
B) Power Steering hose from an 85 cutlass Supreme with a 307 (its next to the original).
C) PS return hose fitting from a mid 80's rear wheel drive GM.
D) Metric fitting and pressure regulator behind it from the back of a PS pump from a mid 80's rear wheel drive GM.
E) Rag Joint from a 79-84 Chevy full size pickup truck.
