Put the car on jack stands and drop a plumb bob down from the places that a tire will hit. Use sidewalk chalk or a Sharpie and make marks all over the floor. You should be able to figure out how much tire you can use, pretty quick.
There are so many dusters out there that I am sure someone can answer the original question. Yes he could do what you mentioned but this can not be the first time. If the question was asked regarding a Dart, I would have the answer so someone here has it!
