It seems that a huge number of fuel pumps across a wide range of makes and models share the same, two-hole mounting base. My AD, Cadillac, Ford trucks, and Mustang all use the same fuel pump mounting gasket.
If one could obtain the specifications for the original pump's arm reach and travel, and volume per squirt, one could search for another pump with similar specifications and create a spacer to make up the difference in reach.
As much as I like mechanical pumps, I'd find an electric pump first.