I don't need to measure it to know that the gap between tire and fender is larger in the front than the same gap in the back, but this has nothing to do with determining if the car is level from to back to front. Again you can have the fender wells cut differently and that throws your measure measurement off with your method. The front fender well is not an identical shape and size to the rear fender.
But optical I looks as a reverse rake now and I guess you dont want that. Even if the car is level now from back to front.