I have a Nor-West 20 foot freighter. It has a 52" beam and weights 325 pounds (dry). As you can imagine it doesn't paddle very well, so I am considering installing oarlocks and equipping it with oars in case of engine failure. My question is the placement of the oarlocks on the gunwale? It has open gunwales and both are 1 3/8" oak, so I think they are substantial enough to equip with oarlocks. Is there a formula to determine their placement?