Awww, I gotta come clean. That head was hot dipped and decked (milled) just a little. It was pretty clean to start with too, however the valves were still crudded up and the cylinders and intake and exhaust ports still had deposits as well so I poured Sea Foam right on there and used a wire brush dental tools and small screwdrivers where needed. The piston tops soaked in it overnight as well. But I've never seen something dissolve gunk like SeaFoam. Do wear protection on your hands though. Those chemicals probably cause cancer.
You should take the baffle covers off your valve cover as well. Judging but your spark plug wells, every inch of that engine has some kind of hardened coat of oil deposit. I wonder if someone else used a stop leak or snake oil additive on it in an attempt to control leakage or oil burn.
Keep in mind that you should re-seal those baffles properly and use a little thread locker on the screws to keep them from rattling out. Unsealed baffles lead to excessive oil in the intake through the breather tube.