I agree with the above. A lot of people see the coked up front head and think they have a problem or they need to flush the engine. But every J series looks like that under the PCV head, it's nothing to be worried about.
Also, be prepared to potentially find tight exhaust valves. They tighten up over time and eventually it gets to the point where you burn a valve if not checked and adjusted.
While you're in there, check the VCM spool valve on the front head for any signs of an oil leak. If this valve leaks, the oil goes straight into the alternator and then you need a new alternator as well, so catching this leak as soon as possible is a good thing.
Also, be prepared to potentially find tight exhaust valves. They tighten up over time and eventually it gets to the point where you burn a valve if not checked and adjusted.
While you're in there, check the VCM spool valve on the front head for any signs of an oil leak. If this valve leaks, the oil goes straight into the alternator and then you need a new alternator as well, so catching this leak as soon as possible is a good thing.