Well, theres a ton you can do.... I would start with some of the basics like so:
*change your plugs to the Autolite 3923's, they run a degree cooler than the stock plugs and make a big difference. Also, change your cap & rotor with a Accell or Borg Warner Select cap & rotor. These have brass contacts and help put more current to the plugs. If your plug wires are ok, leave them....otherwise any 7.5mm wire will do just fine.
*Install an 180 degree thermostat. This will keep your engine cooler and deliver more HP.
*Install a cold air intake. Basicly, a cold air intake will deliver more & cooler air to the engine. Cold air intakes are pretty cheap. I use a Spectre intake for a Honda Civic that I found at Auto Zone....They fit and work EXTREMELY well. and for $50, you get an intake that looks a lot better than a homebrew and will give you some real gains
So if you've got $100, and want to add 10-15hp, I would start here, then work up to more serious mods like headers, cat-back exhaust, throttle body, etc....
If you really want to jump in, I have a used F&B 48mm Throttle body for sale (look in the for sale fourm)
I hope this helps.
