My '62 came with power drum brakes with a single mc reserve. I believe the previous owner installed this and it wasn't factory. I elected to put a dual reserve on and it was suggested to use a '67 Impala dual master cylinder for drum brakes, which I did. Used the same rod and don't recall making any adjustments. I also sent the power brake booster out for a rebuild. Everything works great. As for valve cover clearance, I have to take the power brake booster from the firewall to get the valve cover off. What a PITA, Carmine.