This aftermarket cylinder head has larger intake and exhaust runners for more mid and top end power as well as an improved combustion chamber shape. Your choice of Bradley Performance mid-range or top-end camshafts.  This head has also been converted to full roller bearing cam journals on both ends.   Recommended usage is to be paired with other engine mods such as big bore cylinder and carb.  Comes completely assembled with new valves, springs, seals, rocker arms, and rocker arm shafts.  Link to video on the head and engine performance kit.  https://youtu.be/Nyj67XQP0fg?si=UkiE4foQVDr2oAWp