Looking into the intake ports 4 of the 8 intake valves have gunk on them. 4 are exceptionally clean. Valve guides or valve guide seals i'm guessing.
I bought the engine new in '05 and it's used a quart of
oil every 1000 miles since new and hasn't changed EXCEPT when running the 100 miles from paso Robles to Monterey on Highway 1....then its about a quart for the 100 miles. I have 2 other 427r friends and 1 402r buddy and they do the same.
I'm only a few bolts from removing the heads and freshening them up but I hate to remove a perfectly good head.