any of the MC's from 67 up will work until later when they went to the 2 bolt ones & those also will work with the alum adapter. Just choose the right bore size, make sure if you have manual brakes that the MC has the recess for the little neoprene retainer & if your dart has(front) disc brakes check that your MC choice has no residual pressure valve in the half that would be closest to the firewall. Check by poking a drill bit deep into the brass seat where that line connects & it's spring loaded so you'll feel it if it has one & it must come out for discs to be connected to that half or get another MC & I've used the small reservoir drum MC's with discs with no problems just keep it topped off which we enthusiast do moe frequently than the general motoring public does.
