1964 273 choke pull off number

Chrysler 14-39-7 from the 64 parts catalog
that number represents the part not the specific part. if you look in the list of parts by number you should find that section in the parts book.
below is 67 parts book for reference only
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here are the part numbers ( in 67 there is a list of carbs with a reference number that the number at the top of the column refers to)
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Also since you did not state 2 or 4bbl (CAP or No CAP may not have been an option at hte time) i don't know if this is correct either but another resource.
Carter BBD Choke Pulloff Chrysler & Dodge