If you replace the cam (which has my vote too), you can simply peer down through the valley with the intake off, and see the lower part of the cam bearings; use a mirror through the front and you can see the upper parts. If they have no chunks missing (or maybe just a small chunk here or there), and there is no deep scoring, then you can do it. Some older bearings DO show chunks missing.. it may be due to acids in the oils attacking the bearing surfaces.