I just went through the same thing. I inherited a Samurai that my uncle put the headgasket on backwards, I don't think the cam stopped but the journal was fairly galled up. Since there's no cam bearings to replace all I could do was sand out the material from the journal or replace a freshly rebuilt head, I opted for some sandpaper. It didn't take much to get the bore smooth so I tossed the cam back in and things have been fine since. I can see where this is a some what comon error becuase the oil line running to the head is tiny, it's actually at the front of the head, if you look at the waterpump housing you can see a small bore running up to the head.
