Hello, I bought a 68 GTO Convertible, numbers matching. I'm not happy with the power drum brakes on the car at all. Two questions....first, will a drum to disc conversion lower the value? Just wondering if this ruins the originality of the vehicle. Second, should I just get the front brakes converted? Im told that a rear conversion wont make much difference and will definitely be less expensive. I appreciate all of your thoughts. Thanks!