I have found quite a few posts on this subject, but they are dated, and I am about ready to put the crank back in my engine so figured it would not hurt to ask. I have purchased the Fel Pro rope seal for the rear of my 455. Had my parts for a while and after some research see a lot of recommendations to use a 500 CI Cadillac seal or seals from Fords. Some say small block ford, others say Ford 460. When I took my motor apart, it had a rope seal that was not leaking. Is it really not a good idea to put a new rope seal back in? and is Fel Pro a good part? If something else is likely to give me less grief, what is suggested? Thanks! Going back to the garage to finish putting new cam bearings back in.