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Some may disagree, but this was an engineering change somewhere before 1963.
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I have a copy of a Rochester bulletin dated 1958 which notes in a Pontiac Tri Power page:
" A vented throttle body to bowl gasket is used on all three carburetors to vent any fuel vapors which may form in the carburetor bores to the outside atmosphere. This feature greatly improves hot idle and hot engine starting."
Nothing is mentioned as to whether a hot idle compensator was also used at that time. But by 1959 Cadillac, Chevrolet and Oldsmobile used them and Pontiac had a hot idle compensator by 1961.