1992 LA 360 low oil pressure.

Hi all. Had a buddy who had his factory roller cam LA 360 rebuilt. Upon start up and run, in had low oil pressure and never developed good to high cold pressure. (This was like 10 years ago, so going by memory...lol) I have checked so far:
Driver and pass oil galley plugs are there
Plug under main cap is there (7.5 inches as measured from the oil sender hole)
Pulled the oil filter plate, 1 plug installed there.
Front galley plugs are there...both with oil pinholes in them
After I pulled the cam out, the cam bearings are toast.
There was metal in the bottom of the pan. This thing had like 5 minutes run time.
Am I missing something? When I say rebuilt, it could have been a driveway job...I don't know as I'm not in contact with the guy anymore. Could be that the cam bearings were bad to begin with and if they didn't change them....it had poor pressure from word go. It's going to go down to a full rebuild anyway, but thought it would be nice to know what was up originally. I know it's a total WAG at this point, but the shortblock is still as it was and together. Any ideas would be appreciated.....thanks!