Possibly useful and back on topic.
Not my info, just found this.

https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/413350

Inquire to Drummin52 and Grigg:
- a dodge power steering pump off of a dodge pickup, any year should work up to the year they switched to a serpentine belt setup. They are called a Saginaw P pump, commonly called a "canned ham pump" as the shape is very similar to a canned ham. (my footnote: Same as Chevy) A later pump may work as long as the shaft diameter did not change as it must be able to accept a dual groove v-belt pulley
- a dual groove V-belt pulley off of a GM truck, basically up to the last year until they switched to serpentine belt setups.

Web Blog: (they are talking about a 1961? FAM)
For a six equipped with PS, go to RPO 324, sheet 9.00, which shows the crank add-on pulley as a two groove pulley, part number 3775674, and the add-on water pump pulley (also two grooves) as 3775676. These double pulleys allow both AC and PS to be added to a plain 235 six.

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