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Well, that's is not a so important info (As Ford Says to me once), so they don't info about that. But if you have a used pump, you can take it to a friend who know How to calculate flow rate from gears, is not too difficult.
I remember some way to get an aproximated reading.
Just get an hex rod fron a distributor to manual rotate pump. Using the suction tube let the pump to get oil from a can rotating by hand. after all air is out, put a clean can about 1 galon capacity and the turn the pump by hand while you look how many turns need to move a full oil galon from 1 can to another.
It will give you some idea. If you need to know how many oil is pumped at Idle, just remember Iddle is 650 RPM then oil pump will rotate 325 turns per minute using value obtained previouslly you can calculate it.