I Need Rejet Advice

http://www.motorcyclecarbs.com/Motorcycle_Carburetor_Jetting__W7.cfm

This is what i used to get a starting point for jetting on my gs750. Once you find the jet size you need order +1 and -1 size in case your bike is different.

Honest truth is that if you're going to yank the air box on any engine like that you should really but the jet kit. You can fatten it up to make it run right but the blunt taper needles in stock carbs aren't going to give you the best fuel profile.

My personal opinion, use the factory brand jet kit. They size components based on factory sized parts so if you need to change stuff you know what you need. Dynojet makes good stuff but they use their own numbering system so I hold a grudge on that.