Hello this is a picture of a 2100 2 barrel. I am trying to put this back together having never seen one before. Can anyone tell me what the part that my finger is touching is hooked to? It has a set screw on it so I inagine it goes somewhere. If someone could e-mail me a pic as well that would be great. Thanks, Jeff

 

Cant really tell what you're pointing at in the pic. This might help though.
http://www.hurtle.com/cars/mustang/fixes/carb/

 

the second pic looks like the accelerator pump?..was that taken from the front of the carb?