The basic power steering pump is the same 1967-73 (might go beyond 1973, I don't know).
The basic power steering pump does not include the reservoir, which makes it an assembly. Those then get tags, HEH-BH, HEH-BF, etc.
The only exception, is the 1970 power steering pump used on small block V-8's (6 cylinders?). That one year only pump had a large off set pressure fitting. Requires unique reservoirs and mounting brackets.
Roger Rodes rebuilds them.