Biggest factory combo that will fit is 245/45R20's on 20x8 wheels. There are quite a few variations to choose from. Don't try to fit SRT or Scat Pack wheels (20x9, 20x9.5, 20x11). After that you start using spacers or aftermarket wheels.
The WRT Wheels off the Daytona (Hollander interchange code 2527) are 20x9 with a 19.2 mm offset and also fit without a spacer (warning: they are a bastage to keep clean). With the 245x45x20 tires there was about 1/2" clearance between the tire and spindle, so 275x40x20 might be too wide.