Summer will be upon us soon! Make sure you check the Meets subforum to see if there's a get-together near you!
As for the air cleaner, I don't like the cones or the foam types. After I tore down a motor that used those it really changed my mind. Use the stock air box and use a hole saw to open it up a bit and stay with the oem type panel filters. You can buy a K&N for this and the BF323 application if you prefer.
What is a drilled air box?