I think there are several factors to "fitting" the 275s. First, I think that the extra 2" of arch in the Calvert springs helps. Second, when the car was in the metal stage, during the build, I put the wheelwell trim on and then marked the overhang (extra) and trimmed it back to fit the trim. This gained approx 3/16". The Dana has long studs which makes the install harder. I have to tilt the wheel in at the bottom, then bring the top in. At that point, it goes right on the studs. I have Firm Feel sway bars on the car that eliminate body roll, that keeps the tires from rubbing in a hard corner. (I highly recommend Firm Feel by the way). Thanks for the compliment on the car by the way.