I don't have an answer for the CFM question and unlike the CI capacity of the compressor question, if there is a volunteer that has one of the factory AC cars willing to help out a fairly accurate CFM number would be easy to find using an inexpensive anemometer and a few minutes of time.
Amazon has several handheld units that would do the job. I bought one for less than $20 when wanting to design components and optimize air flow to the additional front AC outlet I installed when building my modern component repro version of a prewar AC unit for the 47.
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