Each will give you a different set of features and amenities, and this includes wheel dimensions. (spitzersheffield.com)
The V8 engine versions have the standard wheel dimensions of 8.5 J x 18 at the front and 10.5 J x 18 at the rear, with tire sizes 235/40 and 285/35. (motor-prime.com)
There's some horsepower calculators online if you take some of your torque readings... should have to enter some vehicle information like curb weight, a cars weight when full of fluids, and exact wheel dimensions in the program for hp data. (mechanics.stackexchange.com)