pre smog test setup

["Peter S." <alfapete@pacbell.net>]

Spit-Listers,
Soon I'll be putting my car through a state required smog test.  I want to
ensure the choke is fully off once warmed up.  What position (or direction)
should I rotate the water choke to ensure its off?
I heard that if the mixture is set lean to pass it can put out low levels of
CO but then the HC goes up (perhaps I have it backward).  Anybody have
experience with this?
Any other things I should know it advance?
Peter S