Replacing Federal pump with Saginaw pump?

fratzog lover said

Anyone know the different applications for the pumps? What came on what, and what years? Just curious myself!

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no rhyme or reason as to which pump went where. During the mid-60s to early 70s they were both installed on any engine, any year.

FWIW: As I searched around for a FirmFeel box on cop cars, all were equipped with a Saginaw pump.