A Saginaw P series pump is the best choice.
found on most all GM and IH trucks and cars from 60's to late 70's, and same thing but metric hardware starting early 80's. (all dates approximate)

The one in my picture linked above is one, with a reservoir for a remote can, most have an oblong reservoir folks call them a "canned ham pump"

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-