Pun intended.  Ok, this case has been apart before.  I don't trust that the
proper fasteners were used in some locations.
Please take a look at the linked photo. To me the nuts on the left look like
sealing nuts without a seal and were installed with the inset side up. These
were found
on the studs at the front of the camshaft, and the rear of the crankshaft.
Is this right?

*http://tinyurl.com/5u6kmv8*

PO's new oil pump had 3 nylock nuts and 1 regular nut : /

Thanks Scott and Frank for your advice so far.