I have a '61 with a 235 and 3 on the tree. I'm drum/drum because it's a 3/4 ton with 8 lug wheels. I found a dozen choices for aftermarket PB unitsin the $200-250 range--but only if I had AT. The best choice left was from CPP, that included a really nice clutch master unit. Intallation was relatively easy, but we haven't road tested it just yet. I believe it was $518 shipped, and included dual cylinder and also a proportioning valve in case I find some discs someday. I let you know how it goes in a few days...