an exhauast wont add 12 horsepower, an intake? well, you probably wont even notice the diffence, execpt in your wallet.
I dont think you will be happy with the sound of that car if you put an exhaust on it.
Maybe comp cams or GM has a cam for it, but i really doubt it.
I didnt wantto be the one to burst your bubble, but i dont think there is anything you can do to that motor, its a roach.
Do you want serious power from this car? or are you only looking to put $300 into it? $300 wont get you 50 HP, i dont care what anyone tells you.
S10's are great for doing small block swaps. you can get a good running 350 for around 1500- 2500 and its a drop in replacement!
Do some researcxh on small block swaps in S10s.
I think thats your best way to go about it.