A desert-land entry within the exterior limits of a Government reclamation project may be assigned in whole or in part under section 324 of this title, and the benefits and limitations of section 448 of this title shall apply to such desert-land entryman and his assignees: Provided, That all such assignments shall conform to and be in accordance with farm units to be established by the Secretary of the Interior upon the application of the desert-land entryman. All such assignments made in good faith prior to July 24, 1912, shall be recognized under this section.