Kelsey Hayes SBP disk break set, what's it worth

As far as I know everything works, no visible leaks. Car wasn't in driving condition when I picked it up. I'm willing to remove everything that's not needed for a BBP set up
I have been seeing them from about $200 to $450 (used/not rebuilt). If you do get to selling them, I am very interested - I want to get rid of my 10 inch drums and keep the the small bolt pattern! The $900 units that one of the members here regularly sells look fantanstic, just out of my budget.