I'm going to for the most part agree with Al on this, but you would notice a big change just going to power brakes. The 68 Nova 396 SS came with finned front drum brakes. From the way I understand it drum brakes tend to fade quicker with extreme use due to the fact that they are not as well cooled as disc brakes are. Back in the 70's when the disc brakes were really catching on there were alot of drag racers who would switch thier front disc brakes for drums. Due to design on disc brakes the pad is always making minimal contact were as drum brake shoes completely come off the drum when disengaged. Now The friction on discs were so minimalistic I don't think it was giving these guys even a hundreth of a second and due to wieght in the end it might have actually cost them a hundreth. It was a trend that died when proven wrong. If you are just building a mild weekend cruiser you could get away with power drums. But if you plan on hot rodding around and showing off a little on and off the track then Disc brakes are the way to go. Also if you plan to make the car a daily driver I would most definately go with disc brakes.
