Injectors and glow plugs will have to be removed.
Tag each injector so they go back in the same location(saves playing in the ECU to set the codes).
Leave the valves.
I'd change the manifold studs and check the screw in water jacket plug is tight while you are doing it.
When I had a head done they measured the face to valve clearance and set them the same after the surface grind was done.


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