200hp @ the wheels, without some engine "adjustment", is a little high for a N/A motor...
Figure that you'd be around 190 engine hp if you do the following mods:
full catback, 2 1/4" pipes
TEC-II will get you close to that number. So will Cobb cams or some of his other goodies.... But it is going to be a little more expensive to go that route vs. getting a smaller stage I turbo setup... That should be good for 225ish.
just my wacky .02