I like the way Toolmanmike has the 255's on his 70 Dart. I'm going to try and get them under my 68 GTS with Torque Thrust II's on it. I do have one of those measuring tools that bolts to the axle hub to check first tho.
The washers will find their correct orientation when you put the lug shank though them and loosely thread them on to the wheel. Probably goes more like first pic.
When I put the new Quarters on my GTS, I'm going to roll the lip of the wheel wells before all the final body work is done , so I can have Max clearance.