And now I have it
... very much in "used / as is" condition (as expected), but no oil sludge I can see and a straightedge showed zero warpage from removal and shipping, so pretty satisfied.
Quite a bit of carbon build up (I would say excessive), appears to start on the sides of the intake, so I'm guessing caused / exacerbated by EGR. But the oil is clean and the valve seats of the part-open valves seem fine, so fingers crossed it hasn't caused issues. A cleaning is definitely in order though.
