Thank you for the replies! What you have said seems logical in that the guns on one side of the ship would be even numbered and the other odd.
Now, to throw you a curve ball...
The officer records in his log that the ROBERT J COLLIER was armed only with a 5"38 at the stern and nine (9) 20mm guns in the other positions. This then suggests a 20mm was mounted at the bow where the 3" gun would have typically been. How do you suppose this effected the numbering of the positions?