Buy the quick disconnects from Direct drive or RMATV. Get a bottle or some people use their radiator over flow tank....I dont know how much that kit is but you can make one yourself fairly cheap.
Also, purge with the same oil you use for the alky......If you run castor 927 for alky, purge with castor 927 in your gas. 20:1 is a little extreme to me but if you have the money for oil go for it.
Everyone will tell you a different way to do it, but the basic idea is to get the carbs full of gas and run the bike until it doesnt want to run anymore. I like to vary the rpm a little when I do it. You will know when its running on the gas, it will seem like its missing and smoking like crazy.