The head of the agency concerned shall fix the annual rate of basic pay for each position in the executive branch specifically referred to in, or covered by, a conforming change in statute made by section 305 of the Government Employees Salary Reform Act of 1964 (78 Stat. 422), or other position in the executive branch for which the annual pay is fixed at a rate of $18,500 or more under special provision of statute enacted before August 14, 1964, which is not placed in a level of the Executive Schedule set forth in subchapter II of this chapter, at a rate equal to the pay rate of a grade and step of the General Schedule set forth in section 5332 of this title. The head of the agency concerned shall report each action taken under this section to the Office of Personnel Management and publish a notice thereof in the Federal Register, except when the President determines that the report and publication would be contrary to the interest of national security.