1968 Brake Problems

I have a 1968 Mustang with about 70,000 miles, 302 v8 with front disk brakes, every time I slow to a stop the brakes make a grinding sound as though the pads were worn down but I have now replaced the pads, rotors, and calipers. It seems as though the rotor is rubiing against the top of the caliper on the inside (there's a line where you can see it rubbing), any thoughts?