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A smaller throttle body pulley will only give you an illusion of more throttle response. It won't actually change how fast your car picks up revs after you hit the gas, it will just make your gas mileage shittier and make your car harder to launch. A port and polish of the intake tract with port matching to your intake manifold will net you a bit of a pump in both throttle response and a barely noticeable increase in horsepower. Knife edging the throttle body helps too, but it is easy to ruin a perfectly good butterfly plate doing this. A short ram on a KA will likely free up 1-3 whp, but will drastically alter the sound of your car. The problem with heat soak off of the radiator won't go away with a cold air intake either. Switching air filters will be barely noticeable, if at all. Don't spend a million bucks on what amounts to a piece of chromed pipe. Spend that money on an AEM dryflo air filter, and get some garbage shit intake pipe. The difference between something like a ebay intake with a dryflo filter and a K&N intake with a K&N filter will be un-noticeable. To increase throttle response, make sure all your vacuum leaks are gone. Running premium fuel will help as well, assuming your ECU has no faults already. Changing your spark plugs to something like an NGK Iridium, with something like NGK or Granetelli wires, changing your distributor cap, and button, and changing your oil will also help.
In short, just get your shit up and running the way it was meant to be from the factory is the first step to any build. And yes, a short ram intake will help, and since you're buying a paper filter every 12,000 miles anyways, you'll probably save money with a lifetime cone.
Edit : Also, replace that muffler with a catback, or if you feel like dumping more money, a full system exhaust. A muffler on the end of stock pipes will probably HURT performance. A muffler on 2.5 inch mandrel bent pipes will net you lots of things, but on stock pipes, a muffler won't do you a bit of good.
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