Boosters pull fuel out of the main well via vacuum signal in the main bore. Boosters are actually a second venturi, and the smaller bore, coupled with lots of small holes around the ID (aka annular) let it react faster and more crisply in a carburetor that's "too big" per usual thinking.
Like the above two posts, if you have enough motor to require a 950, but that much carburetor doesn't work well (is mushy) at lower RPM levels, then a change to annular boosters will likely help.
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