Flywheels are kind of like differential gears in the sense that they can radically change how the car performs. Swapping the stock piece with an aftermarket aluminum or steel piece won't net you any power, but the engine will rev faster due to less weight, thus acceleration will increase. With this increase in performance, however, comes a decrease in overall driveability. As a street car, you may find the revving nature of a billet flywheel to be somewhat annoying. For this reason, performance flywheels are recommended mostly for acceleration-built or racing applications.
Remember…The cable, quadrant and flywheel are some of the necessary components to check when doing work on the clutch. At the minimum, a new clutch cable is a good idea when replacing the clutch. It is cheap insurance! One last note, if you are purchasing a new flywheel, double check that you are buying the correct flywheel with the right external balancer. Different years used different weights.