Need some hep.

I am running a Speed Demon 650 have not got it tuned in just right but once you get it id download instructions from Demon.I am liking mine,I learned a lot about them from Don at FBO .I still need to drill air bleeds on mine...
850cfm= 1-3/4" throttle bore, 1.56" venturi
830cfm= 1-11/16 throttle bore, 1.56 venturi
750cfm= 1-11/16 throttle bore, 1.45 venturi
650cfm= 1-11/16 throttle bore, 1.25 venturi
[ame]http://www.demoncarbs.com/Assets/docs/Tech/Carb-identity-Mighty.pdf[/ame]