Troubleshooting Head Components

I would say a valve-job is in order, & new valves/reconditioned guides as needed, I do NOT mean knurling the guides BTW.
While You're at it, get the head milled .040", that'll recover the extra thickness of the new head gasket(unless You have a new shim one) + bump it closer to where it shoulda been stock. Don't forget to back the rocker adj screws off about a turn, go from there when You've got it together.
Coolant, sop out what You can with paper towels as soon as You can, I usually turn the engine a few times re-wiping the cyl walls each time.
P.S. Always always always check the oil feed hole from the deck up, & from the rear rocker pedestal down, clear & clean w/solvent & compressed air if needed.