All I can hear is the lifter tick? My Z sat 8 years before I rebuilt and started it again. The lifter tick was bad on mine so I flushed with synthetic oil and some Marvel Mystery Oil. It eventually loosened up and sounds normal now.
Just my experience. Good luck! It does sound kind of "airy" though?
If I would have known addiction was this expensive I would have seen a shrink a long time ago. --BadZCar (FL)