The tube just drops down in front of the tire .
The carb you have is probably the best carb you'll find for that motor . Just clean it and see about finding a stock air box , filter and connecting tube . That's the easiest and quickest path .
IF Suzuki thought there was a better set up , they would have done at the factory .
If you can make the stock set up run the way it's suppose to , you'll be doing good .