front disc brakes

[Cliff]

I have front disc brakes on the 72 chevy and they are dragging slightly. I cannot findout why. I replaced everything upfront. new rotors new pads new calipers new brake hoses rubber and metal, new bearings (inner and outer) new races in the rotors and I am still having the same problem as i was before i replaced everything. After a short trip you can feel the rim and all is warm and you can smell the brakes. Thanks guys for all the help. The truck has power brakes as well if that helps.