Thanks for the advice , do those metal rocker clips actually work? Does the 454 require 20w50 oil , someone told me this would quiet the lifters . The block is a 74 mark 4 and I am currently running 10w30 syntec synthetic. Also yesterday I found a broken mech advance spring in the dist. could this be my popping and missing , I haven't run it yet since I replaced the spring , thanks again