Could anyone suggest a replacement cam for a 1974 Roadrunner 400 "P" code motor? I don't want to change the factory rockers or pushrod length if I don't have to? I see Sealed power CS-661 or kit KC661 with lifters, or Yearone MP31, Comp Cams 21-212-4. Cannot seem to find the exact specs of the original. Heck, what would Worman use? Also anyone use the Sealed power rockers or arms (vintage)
