HI IM NEW OUT HERE WAS TOLD I MAY GET SOME HELP (Jr Wills )said you old timers have good memorys on 455s I have a 1970 xblock with a match set of heads from 1969 cast #1109 stage 1 they have an R/D#stamped. On them and both # are same for a pair. sure could use some imfo. I am having. A hard...