I am trying to model a car in Blender and I have set up the blueprint so the hood is to scale in both the front and side views. However, the headlights are not lined up correctly even though the hood is lined up fine. This is what I am using: http://www.the-blueprints.com/blueprints/cars/buick/39369/view/buick_park_avenue_2007/
Are you in ortographic or perspective mode?
Blueprints only line up in ortographic mode and only if they are well-made.