There is a lot of power potential in these cars. A blown engine is always the best way to go, but your N/A engine is pretty perky too. The first thing you should do is get a 180 degree thermostat. This will keep your engine running cool. There is a weakness in the plastic intake manifold. It is prone to cracking. If you get the thermostat, it will make it last much longer.
Another thing you could do is make or buy a cold-air intake system. You want to run a straight pipe from the throttle body with a cone filter. Those seem to be most effective.
You can also go hardcore and maybe do some exhaust work, add high ratio rockers, upgrade the ignition, and if you have the money, buy a CSC.