Technical WCFB choke/fast idle adjustments

Can anyone familiar with a WCFB explain to me how this piece is supposed to work? I'm setting up this Carb I just rebuilt but this tab that grabs the pin in the base of the carb seems to be keeping the secondarys from opening, even with the choke open. I've got a half mind to leave it off but then I won't have a fast idle with the choke closed.

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There's a bunch of really good pics if you google wcfb choke linkage , maybe they will help

 

I have some tech sheets at work for the 1954 Chrysler version. PM me tomorrow in the daytime and I will copy and post what I have.

 

I got it guys. After the rebuild I just threw in the slow idle speed screw a few turns. After I backed it off properly the throttle linkage moves forward far enough when the choke plate is open to reset that lever. Thanks everyone!

 

Glad you got it figured out. Here are those tech sheets.

 

Great,thank you