What rear end do you have? What suspension are you running? Do you have any fancy control/strut arms/bushings? Brakes? What year Charger? All are details that are going to help us, help you.

The easiest method is to take some cardboard, and make a mock up wheel and measure. Compare your current wheel and tire setup to your new wheel and tire setup with this site: https://rimsntires.com/specspro.jsp