For the purpose of computing a school district's equalized subsidy for basic education for the 1982-1983 school year, as provided for and limited by 24 Pa.C.S. § 2903(b)(2) (relating to limitation of certain payments), the Department of Education shall adjust the computation of payments on account of section 2502.9 of this act for the 1981-1982 school year as follows: The department shall recompute the district's guarantee, as provided for in section 2502.9(a)¹ of this act, for the 1980-1981 school year, so as not to account for the subsidy increase limitation imposed by the act of July 1, 1981 (P.L. 628, No. 5a), known as the “General Appropriation Act of 1981”: Provided, however, That no district shall receive a lesser subsidy for the 1982-1983 school year under the provisions of 24 Pa.C.S. §§ 2902 (relating to payments on account of instruction) and 2905 (relating to economic supplement), or section 2502.10² of this act, as a result of such revised computation and that no district shall be entitled to an increased subsidy payment for the 1981-1982 school year as a result of such revised computation. If the amounts appropriated for the equalized subsidy for basic education for the 1982-1983 school year are insufficient to pay in full the amounts to which districts affected by the limitation in the “General Appropriation Act of 1981” are entitled, payments to such districts shall be proportionately reduced to the extent necessary to bring the payments within the limits of the amounts appropriated: Provided, however, That computation of payments to be made beginning in the 1984-1985 fiscal year shall be based upon a district's full entitlement under the provisions of this section, any such proportionate reduction notwithstanding.