I know your car is a 67 and if they are the original four piston calipers then in my opinion send them out to be rebuilt and sleeved. Many folks don't realize that the Camaros used a smaller piston then the Firebird but because they built almost triple the number of Camaros most of the cores that companies with your exchange are selling are the smaller piston variety. Because it can be a crap shoot to get the right ones, I recommend letting one of the quality rebuilders do yours. If they were converted to 69 and later single piston then just get rebuilt ones at your local parts store.