Carburetor mystery

[topchop]

Carburetor - Holley Model 59 AA-1
Car – 1947 V8
Symptoms were stumbling when accelerating, either cold or hot.
Just rebuilt the carb with a MAC’s carb rebuild kit.
Runs wonderful. Not used to having no delay when mashing the pedal...


Here’s my question.
There is a #6-32 tapped hole in the Bowl cover. It looks like a piece of gasket material was used as a seal. (See pics). Does not appear in the instruction sheet. I did not install it. Should it be there?