$2k really isn't much to work with. You'll spend that easily trying to do anything with your current engine along with a manual swap. A B-series swap could easily top that as well.

If you just have the urge to spend that money, upgrade suspension and brakes. Otherwise, just save up until you have about $5k to work with, because a turbo LS or GSR manual will probably be a lot more rewarding for you.

Also, unless you're very attached to that car, life will be much simpler for you down the road if you sell that one and buy a manual tranny car.