K&N Pod filters with outer exhaust baffle removed

I am new to motorcycle riding. I bought my 79 kz650 from someone I used to work with. He gave me the pods and the airbox boots he was going to put on. This bike needed some work. I have not found the sweet spot for tuning this. I have tried looking for many solutions but have no came up with any. My mid and high rpm range are good, im just having trouble with idle. Does anyone know where I can get good carb holders with vacuum ports? Also, does anyone know how to tune these? Any and all help is greatly appreciated.

If cheap pods they will probably block idle circuit air jets, you will need air corrector jets to stop off idle stumbling and improve low end running, chances are with a bike hitting 50 years old the stock jetting is not in the carbs so will possibly need going through and checking.