One word of caution. After you have finished all of your welding be sure to have the head stress relieved. I learned this the hard way after building not 1 but 2 sets of Harley race heads, and having both sets crack in the very same spot. Finally a guy on Long Island who did work for Bill Jenkins repaired both sets of heads and gave me a short lesson on modifying and welding on iron cylinder heads.
Good luck with your project..............Ted