First off, I'm not part of the Stovebolt Forum police. Anyhow, I too have the same problem you have with my 3600. I haven't tried anything yet but I may try to fabricate something in the future though. I believe a rotor form a late model Chevy 4X4 will slip over the the spindle/hub assmbly. The caliper bracket is another story though. You'll have to fabricate something on your own there. For the rear, try
www.TSMMFG.COM, they may also be able to help you out with the front too. Now the other issue is the Master Cylinder. There are plenty of those kits out there from CPP, Master Power, and others.
Good Luck
Chris