[GeneBob]

I recently looked into changing over to hydraulics but ended up rebuilding my mechanical brakes. Here are some good sources, Cling's (as mentioned above), Boling Brothers/MT Products, Snyder's Antique Auto Parts. Snyder's sells Boling kits. I feel the Boling kit is the best bet. It is straight forward and uses the self energizing brake parts. If you try collect the original era parts, you will spend a lot of money, do a lot of modifications and end up with non self energizing hydraulics. Also, Boling sells partial kits if you want to do this in stages.
For what it is worth.