ring a round
i vote new, just in case down the road you have any issues at all you will second guess the decision to not replace with a new one.....but recently I have had some new parts fail also: oil pan flaps breaking, cams, valve spring, an engine guy told me he send back some heads he had recieved beacause of poor quality, so new stuff can have qc issues.
but I vote new
good luck
jmo