What's the plan for the new head?

I can hear the noise in the video, hard to know what that is without more diagnosis. Are you thinking that is a bad valve or something else wrong in the valve train?

How about sending a used oil sample for lab analysis, that may tell you what metals are too high, which can sometimes pin point the failure mode (bearings or rings).

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC