+1 on the Edelbrock Performer intake. I went with an Edelbrock Performer 600cfm carb as well.
If you haven't already, look into upgrading the distributor, coil, plugs, and wires. There are lots of options out there, including aftermarket performance dizzies (MSD is a favorite), conversion set-ups (Duraspark or Pertronix, for instance), or even just sticking with the stock set-up and refreshing the internals. This can be a relatively cheap upgrade (depending on what you go with) that provides some reliability and a little bit more power. Usually runs a couple hundred $$.
Cam, lifters, push-rods, rocker arms, valve springs, valve job, and port/polish mated up to a good exhaust system. Helps the gases and whatnot flow better and quicker for more power - this is the heart of the engine's power-making ability, and can get expensive fast (upward of $600+).
Rear gears will make a difference as well. A 3.00:1 rear gear is a "cruising" gear for lower-end power engines & economy. Adding more power to those gears will raise your top speed while the extra power overcomes the off-the-line sluggishness somewhat. Switching out to some 3.25s or 3.54s will give you some more low-end grunt (off the line) and decrease your top speed a bit. Another couple hundred $$.
Those estimates are if you can do the work yourself. If not, you'll need to budget in the cost for a shop to do the work.
To save some more money, you might consider taking an auto shop class (if your school offers), as they usually will allow you to work on your own cars (supervised by the teacher, and the project will become a training aid as well).
Hope that helps!
