I want to get new racing wheels for my car. I just ordered a Moser 9" Ford rear same as stock length. How big of a rim can I get, 15x??. I want the biggest possible in the back without tubbing my rear or ahcking anything. My only concern is the fender. Also, can I raise the car with shocks or lifts so that the wheels will clear the fender or will this hurt my 1/4 mile performance?? Thanks in advance