Your bearings appear to be OK. If the cam journal bearings were contaminated, you would see full-circle score lines on the cam journals. Check all of them. If there is not substantial scoring, then you should only have normal wear, which is generally minimal in these engines. The journals are pressure-lubed. You can access the lifter oil galleries by pulling the plugs at the front of the block. But if you do not have any scored journals, then there likely isn't anything left in there to remove by now.
Cam lubrication trivia:
OK, ready to hear a huge myth busted? The reason for elevated rpm during cam break-in is not lubrication by splashing. It is to have enough surface speed for the lifters to hydroplane on the oil film, to prevent the fresh microscopically-rough surfaces from galling
under the high contact pressure. When the damage is viewed, the typical reaction is that lubrication was not sufficient, when in-fact the oil flow from the bottom of the lifter bores is substantial. Oil pukes from those puppies. This is one reason pre-lubing is highly regarded in critical engine applications before first start or after long storage, as pressurizing the system covers the parts—including cam lobes—in oil, providing lubrication before any parts move.
While the flat-tappet lifter spins due to edge contact on the slightly angled surface of the cam lobe and convex surface of the lifter bottom, it can throw-off much of the oil onto the lobes nearby. This is one source of the "splash" lubrication you hear about. Another is oil thrown by the crankshaft, and oil mist from anything moving. With the direct flooding from the bores, and all of this splashing, even at cranking speeds, the lifters are slobbered with oil. So, with all this oil, the missing element is enough speed for the lifters to ride on the "oil wedge", and therefore the recommended raised rpm during break-in. Once the surfaces are smoothed and slightly worn-in , the rpm can be reduced without losing enough oil wedge clearance to cause galling. More than you wanted to know, eh?