I would highly caution you on doing a 3.4 pulley if you have not done any other modifications. I would first focus on a few other mods to begin with. Like an intake such as a Fenderwell Intake or even an open cone intake or any of the numerous aftermarket intakes available. Next on my high priority list would be a 180* Thermostat, or a 180* drilled Thermostat. After that I would look for a 2.5" or 3" down pipe that would include the Ubend Delete and after that I would work on the ignition system with some new Autolite copper core plugs and low resistance plug wires. Your stock plugs are 606's I believe and you could drop to one range colder by using 605's.
After you get that done, focus on getting a scanner or some way you can hook up to the computer to monitor whats going on with the engine, particularly KR (Knock Retard). If at that point you are KR free, then you might look at a 3.5 or 3.4" pulley. If you have KR at that point I would look at what could be done to get rid of the KR. At that point I would also look at possibly getting an Overkill Motorsports PCM. They can custom tune your PCM and that will bring the car to life as well take advantage of any mods you have done to that point.
Good Luck, just dont be tempted to slap a pulley on there as there is a dark side to doing that without having prepared for it.
