Most kits have more parts than needed. Your kit might have enough parts to do vacuum secondary carbs, also. Older vacuum secondary carbs had a check ball where the secondary diaphragm housing attaches to the main body.
I'm pretty sure there are no "balls" in a double pumper.
Tom V. ?
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1977 Black Trans Am 180 HP Auto, essentially base model T/A.
I'm the original owner, purchased May 7, 1977.
Shut it off
Shut it off
Buddy, I just shut your Prius down... 
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