you arent going to get much HP out of that at all.. you can go with simple bolt ons such as headers and exhaust and then get an engine management system and a tune.. an intake alone will get you pretty much no horsepowere, just better throttle response.. you're not going to be able to get a significant increase in HP with your naturally aspirated motor, or if there are parts out there for it, it would be cheaper to turbocharge the car
my advise, keep the car stock and in good driving condition and pick yourself up a real project car