I am not familiar with a Ruggles bushing, obviously the best way to handle this is to get an off center rod, but they are all but gone.I wouldnt cut any off the piston boss, the small end of the rod will suffice, you may need to mill some under the dish where it is blended into the pin boss area. The rod will be side loaded somewhat in the pin area and you will have less surface area because the rod has been milled on one side, but remember on an off center rod the bearing is side loaded and when you really lean on an off center rod, the side loading of the bearing is obvious upon teardown. I have not seen this when using an on center rod in an off center block, therefore I believe reliability is not compromised.
Bill