If you replace the stock rocker arms with adjustable ones , the pushrods also must be changed , the originals having ball ends on both ends, and the adjustable rockers requiring a cup on one end . The FE pushrods are the wrong length ,but I found years ago that 1954 to 1964 Ford 223 6 cylinder pushrods work just fine.

That's great info Keith. I edited my entry post accordingly. See viewtopic.php?f=52&t=64
Thanx