I used this kit. Everything but the bracket is available off the shelf at your FLAPS. There are some junkyard conversions using AMC parts, I think. Do a search on the Econo yahoo groups. http://www.dddiscbrakes.com/kits.html
Also these http://www.jalopyjournal.com/forum/showthread.php?t=159016 http://www.tsmmfg.com/1190.htm http://carnut.com/tech/econo/econo1.html
The one from tsm and DD bolt onto the inside of the spindle flange. The one in Carnut bolts to the outside. They both use the same caliper. Is the disc the same?
Go to carnut.com and go to car tech. Has a 61-67 Econoline conversion. Contact Roger Mingus and he wll send you the info and template for the plate.
To see the words "cheap" and "brakes" used in the same sentence make me glad I don't live and drive in your hometown.