95GTman

I have a 95 GT convertible, 5.0L, 5-speed. Everything is stock. I would like to know if there is a way to get better performance (i.e. more horsepower) for relatively cheap (less than $50) or free. I've heard about swapping a in a '93 GTcomputer, bumping the timing, installing a lower degree thermostat, etc... I am good with my hands, so whatever it is, I could do it myself, I'm just not rolling in money right now that I could drop into the car. Any help would be appreciated.