This chapter shall become effective on January 1, 1984. Only nonfiscal retirement bills may be introduced at the 1984 regular session of the General Assembly. Retirement bills having a fiscal impact which were introduced at the 1983 regular session and which are still pending at the 1984 regular session shall be subject to the requirements of Code Section 47-20-50, except that the amount determined by actuarial investigation under paragraph (10) of subsection (a) of Code Section 47-20-36 shall be determined by the director of the Office of Planning and Budget and the state auditor pursuant to Code Sections 28-5-42 and 28-5-43, relating to fiscal notes.