A good adjustment is probably a great idea. Older motors also begin to build oil deposits after time making it harder to get full oil pressure to the head, so get an oil system flush, and mke sure you're using the proper weight oil for your motor and the operating temps you're looking to run at. Cold oil is usually not viscus enough to get the proper presure where it needs to be. That's one of the reasons you don't want to use high RPMs on a motor that isn't up to temp.