Originally posted by stevebfl
The wheels won't change the alignment but they will change what the specs should be. In the end the guy doing the alignment better have a good idea.
In the long run alignment specs will have to be developed to deal with what you have done. I would suggest a few extra millimeters of toe based upon the direction everything moves under the extra loading. Those can be applied now or later.
Back to the original question for a moment...
I am indeed confused.
I can see why the lower springs could influence the desired settings, such as the toe or perhaps the camber, but why would the wheels/tires themselves be a factor at all?