The department may impose such limitations, restrictions, and conditions upon or in connection with the benefits conferred pursuant to the California National Guard Members’ Farm and Home Purchase Act of 1978 (Article 4 (commencing with Section 270) of Chapter 3 of Part 1 of Division 2), purchase contracts entered into pursuant to that act and this chapter, and revenue bonds issued pursuant to this chapter as may be necessary in the judgment of the department in order to better assure or preserve the exemption of interest on the bonds from federal income taxation, notwithstanding anything to the contrary contained in that act or this chapter.