Wanting to Add Power Brake Booster

A few years ago, there was a full kit on ebay - booster, MC, stand-off brackets w/ lever, pedal rod for $170. It looks like they adapted a common classic Chevy booster. I haven't looked lately. If you can find the stand-off brackets w/ lever and rod, you can mount a later booster to the brackets. In my 1965 Dart, I used a booster from an Intrepid and only required a little rat-tail filing of the holes to fit brackets from a 1974 Dart. The input to the booster is a flat rod, which fit into the lever (might have added a spacer washer, forget). That allows you to use a common 2-bolt aluminum MC without needed a 2 to 4 bolt adapter plate. You see it in my avatar.

Ignore people fussing about changing to front disk brakes. That is a separate issue, and with a booster you will be setup for later disks. You would have to add an adjustable proportioning valve inline with the rear circuit (I did), which costs $30. Adjust so the fronts skid just slightly before the rears in a wet parking lot.