I am going to be a little different and avoid a PI swap. I am burning oil and suspect the valve stem seals to be shot. I plan on finding a pair of Romeo npi heads in the junkyard and assembling them instead of changing the seals with the heads on the block. What else should I replace in the heads before installing? I plan on doing a small port and polish job on the heads. Head gaskets and timing chains should obviously be replaced. What else should be done?