btw, if you plan to keep your current engine, you can try getting a bit more power out of it by installing "UNDERDRIVE" pulley kits. These are replacement pulley wheels which makes your accessories (a/c, waterpump and alternator) turn slightly slower. The result is a few more HPs to accelerate your car.
Also advancing your engine's ignition timing (by 2 to 4 degrees, depending on your choice of fuel) is a quick way to get more power BUT it dramatically increase fuel consumption. Good for a night of racing, bad for daily driving.
I also used TORQUEMASTER sparkplugs (http://www.torquemaster.com) along with a good set of high tension wires and MSD ignition controller (model 6A). This particular set of upgrades did prove to enhance performance if done together.