Hi cadillac52 and welcome to the ford Six forum. If you still have all the OEM 1957 early top end parts: IE a 1954 to 1960 Head, with the stock early Rocker Arm Assembly, and an early Valve Cover. the later 1961 to 1964 223 Rocker Arm Assembly though they will bolt onto the older Heads, yet there won't be a way to attach the early valve cover to those later Rocker Stands. Good luck in your hunt