A Body Disc Brake Swap 101

Hi guys , just a little FYI here , i have done at least a dozen of these swaps on A bodys from 67 to 72 and i have never once changed the proportioning valve, the cars stop fine and had no issues what so ever , the master cylinder also works good too , however if you use a master cylinder from a dodge truck with power bakes you get a really nice pedal feel and effortless brakeing . ( I also do not do these with power barkes )