What about your other cam bearing? On a SB the #2 & the #4 cam bearings have 2 holes to direct oil topside rather than just (1) cam bearing for BB's. If your other one is dead on like the one in the pic(I would think it is since that one is good), & you have checked your rocker shaft alignment & if your turning the crank slowly by hand(& I'm thinking you are) that pretty much leaves a problem with the head gaskets blocking the(2) holes on each bank.