is a 8/72 build date a 1972 or 1973??

August 1st 1972 is the first day of the 1973 model year. They should be big bolt pattern single piston calipers. To use this set up on a 67 car you will need spindle assy's, lower ball joints, and upper control arms.

Here is what you need to do the conversion:
http://www.bigblockdart.com/techpages/dbconversion.shtml