Cam bearing issue

While the second oil change in the engine I finished building recently, I noticed some non-ferrous particles in the oil. After a teardown, I saw some pretty aggressive irregular wear(all the bears have it but it's more prominent in the front ones). only happening at the bottom of the bearing bore. The cam was pretty tight as it came out but it had 0 wear or damage, it looks immaculate. This is a new cam I had made from Oregon cams for this build, LA-based so it would have the head oiling holes. installing cam bearings and checking clearance was the only part I wasn't able to do(was getting ready to move from CA to FL) I had the local machine shop do it. I'm not sure of the cause of this but I don't have the same arsenal of precision measurement tools that I had back in CA. I would appreciate it if you guys could give me some advice and how to approach this situation the right way. these are my theories so far

• Cam journals are too big, they need to be ground down
  
• Cam could be out of round
• Cam tunnel could need a line hone due to misalignment of bearing journals and/or journal size issues

I'm leaning towards the first one since the cam bearings that came from the engine originally didn't have any unusual wear. I know I'm probably gonna get grilled for not checking that part of the build myself but I've accepted it's a mistake on my end and it's a learning experience that I'm thankful I was able to catch before it caused more damage.

I'm hopeful a quick trip to the machine shop and another deep clean of the block with soap and warm water will put me in the right track again
Thanks in advance for the help
Edit: Forgot to add this is a magnum 5.9l block, but it has the head oiling holes in it.