It was basically a sporty appearance package and included a bunch of options that were not standard on the base Firebird. It got you the higher trim level interior, the added insulation, the lighting package, gauges I believe, aluminum wheels, the special hood, the T/A smoked taillights and some other standard items too I think. A friend of mine knew all about them, but he has passed on recently and I can no longer ask him about those things.
But besides the hood and taillights, you could get every other option on a base Firebird.