Be REAL careful with any lift over ~.510 on a Ford, especially with stock type heads. A .604 lift WILL NOT work without being very careful in your piston selection.
Oh and the stock rocker arms are 1.6, not 1.5 with 1.7 being the option.
You have no gain by using steel roller tip rockers which retain the sliding fulcrum. You may also get into push rod length problems whereas the standard sliding tip aren't so fussy as to where they land on the valve tip