I have found a 272 that has been machined to 0.060 over. The deck is flat. The ECZ-G heads are flat. No machining required. I know the heads have been machined before. Not sure about the block. Here is the question. Long or short push rods? Does it matter? I was planning to use a short set but after thinking it over and factoring in the fact that the head gaskets are thicker than originals and I'm using the lower ratio rocker arms. I'm leaning towards buying brand new longer ones. Better to adjust out some extra length than try to adjust for shortness. Thoughts? JJ