Too bad I didn't see any mention of hardened value seats installed at the time of refreshing. Would have helped with the value and resale in my humble opinion ???
if you look at the typed document under "sixth" it says something about installing valve seats. the PN referenced comes back as a "high chromed alloy seat" and acceptable for use in converting to use of unleaded fuels.
this is outside of the purview of my expertise, but it *seems* as though that would indicate hardened exhaust seats.