Never had a issue with cam bearings. I always check to make sure that the oil holes are lined up.. Even this if they are off a little bit will NOT hurt anything. Are the oil holes still lined up?
The engine looks trashy to me... whats all the pieces of blue and orange paint.
Cylinder walls look scored too. I have run engines for thousands of miles that look better. Bearings also dont look good IMO. They shouldnt even look like the crank has rolled over on them.
Pull the filter cut it apart, and the oil pump see what you find!
Good luck