CAMEL HUMP HEADS ARE 60'S 327 HEADS AND OFFER GREAT POWER FOR WHAT THEY ARE BUT THE DRAWBACK WITH THESE HEADS ARE THAT MOST DO NOT HAVE ACCESSORY HOLES IN THE FRONT OR BACK OF THE HEAD, MEANING INSTALLING THE POWERSTEERING, ALT, AC, PB ECT. IS GOING TO BE TOUGH!IF YOU ARE CONSIDERING THESE HEADS LOOK FOR CASTING (462) RATHER THAN (461) SOME 462 HAD ACC. HOLES DRILLED IN THEM!