Are these repairable or not. I'm wondering if having the cams milled. Then installing cam bearings would be an option?
This is a pic of the one with the worst damage.
Durabond makes a replacement bearing for the cam journal towers. But, I think it only comes in a standard sized inner diameter only. A good engine machine shop should be able to find out. The cam journal looks like the damage is pretty deep. I suggest durabond bearings for the head ( if damaged ) and a new camshaft(s). The tolerance/clearance needs to pretty tight in order to maintain oil control and a strong film of oil.