broken pin on rocker-arm need help

I guess from the initial post, you found that your rockers aren't a factory design and are of questionable heritage and reliability. New roller rockers are quite expensive. Unless you are set on such high dollar after-market parts, your choice is either original stamped metal rockers or factory adjustable rockers from a ~pre-68 273 small block. Used prices are ~$20 former and ~$75 later for a complete set w/ rocker shafts. There are also new adjustable rockers on the market (Crane I recall).