I changed the valve seals after hot tanking, removed the valves and oiled them well. The machine shop checked that the heads were square. The heads have been off before, not sure why (single owner/little old lady)but the machinist indicated that the old gaskets were very crappy in there day. No longer sold apparently. I replaced them with Fel-Pro.
I have no specific reason to change to a HV pump. Just wasn't sure if it would be beneficial.
I noticed lower oil pressure on the guage before (not sure the figure)but I think it might be the guage or sender. Seamed to get lots of oil at the top end.
Thought while I have the pan off changing the gasket I would change the pump.