Mystery film on cam lobes

I just bought a rebuilt 340 long block & noticed the cam lobes are covered with a waxy substance. It’s dry & kind of waxy feeling. It has been sitting for a while since the rebuild, so I’m thinking maybe it’s some kind of cam assembly lube that dried out or something. Is this a coating that’s still good, or do I need to pull the cam & clean the lobes & put fresh assembly lube on it?