I used one from CCP - most likely very similar. The swap isn't too difficult at all.

I had the "while I'm at it's" and replaced all the lines with stainless lines as well as replacing all the rubber lines.

I had to make two small lines to connect up. I used part of the stainless kit and one small line from my local flaps. A little bending and your done.

http://img.photobucket.com/albums/v228/Avette4me/My%2058/Brakes/Initialmockup.jpg

The job took me a day, but I don't really hit it hard in the shop. I also made the access hole a little bigger to make it easier as well as use my power bleeder.

http://img.photobucket.com/albums/v228/Avette4me/My%2058/Brakes/HoleforMasterCyl.jpg

http://img.photobucket.com/albums/v228/Avette4me/My%2058/Brakes/CoverforMaster-mockup.jpg

The big picture
1958 Chevrolet Stepside in the Gallery
Photobucket album