Don't bother porting, as you'll just slow the gas down and ultimately lose power (although you might gain some somewhere, the overall loss will be bigger than the slight gain, and you don't want a racing engine!). Don't bother polishing - this tends to make engines run worse. Notice how, whenever you get to see inside an F1 engine, how they are NOT polished? They are "as-forged" (minus flash removal). And F1 wants every last 0.01hp they can find, especially if it came from polishing.
Your compression ratio, at 9:1, might be fine in general terms, but your engine will bet set up at MBT (this is NOT Maximum Best Torque, which is something fools think) by the manufacturer, and not be a million miles away from it's knock limit. Even though it's 'only' 9:1, to avoid knock (and possibly pre-ignition later on) you WILL need to drop the compression ratio to get any meaningful boost from a cheap, fake blower.
As for sprockets, you'll need to work out the tractive effort at your wheels in each gear and 500rpm increments and decide what you want from your gearing. No point having the bike at 1,000,000rpm whenver you get close to cruising speed, as you just make noise, waste fuel and look silly.
It's all a compromise. Do something and you will lose something else. For $200 I have a suspicion that you WILL lose more than you gain, and ultimately as a road transport device your bike will become slower, thirstier, more annoying and less reliable.
You have been warned.
