I am looking to purchase 20" Shelby CS40 wheels with Mickey Thompson Street Radial 305/35/20 tires and what should I get for the front? Would the 20" street slicks hook up just as well if they were 18's? Are these tires too short or tall for the car? I am deciding if I should do those wheels and tires, or save the money and add some 305/35/18 MT Street Radial to my stock wheels.