It really has nothing to do with the way the posi will perform. Check this cone out in the case... see if you can spray some paint ont he cone area and install it back on the side it was ...see if the paint rubs off ...IF it does your cones is just on the edge of hitting and will need to be machined if you want it to work correctly - And if that is that close the other side might as well get done too as i am sure it is not too far behind.
Remember this thing is 30-40 years old.