I've been thinking about doing this for many years. I'd like to keep the 4 speed. Some sources have stated that a 1" bore Corvette master cylinder from 1967 to 1976 will work if going with no power. An aftermarket crossmember came with the truck so that is an option as showkey has stated. I found that updating to a dual master cyclinder was a relatively easy project. I used a cyclinder from a 60's something GM. It was from the first year GM used a dual master cylinder. Works well with the original huck brakes.
