Welcome to the site!
As these are a spec type car, dirt and pavement are about the same. Spring rates tend to be the biggest change. There are several old threads on switching from dirt to pavement or via versa. Gearing may be different as well. What track(s) will you be running at? Might be able to get you in touch with a site member that has some know on set up. I can always try to get you in the ball park.
Steve