64 valiant disc brake conversion

I did the conversion on my '65 and got everything I needed from a scalped '65 cuda. The problem arose when the brake shop was rebuilding my calipers he said not only did I need the correct tandem master and proper proportioning valve but the power assist was a must to push the hydralics evenly with good feel. The correct booster is very, very rare. There are several that have the needed gooseneck bracket to clear the hood springs that are easy to find and look like horizontal coffee cans but you have to have the larger air capacity can (looks more like a sideways b-cake) to get the proper action. Good luck, Frank