All revenues arising from the taxes hereby levied applicable to Lauderdale County outside the city limits of the City of Florence shall be used exclusively for public school purposes and solely for capital outlay, construction, and maintenance of the county public schools in Lauderdale County, provided, however, that in the event the Governor restricts allotments of educational appropriations made by the Legislature to prevent an overdraft or deficiency in any fiscal year for which appropriations are made by prorating the available educational revenues among the various departments, boards, bureaus, commissions, agencies, offices, and institutions of the state, the revenues from the taxes hereby levied applicable to Lauderdale County outside the city limits of the City of Florence, in the discretion of the County Board of Education of Lauderdale County, may also be used in such fiscal year for general educational purposes, including the payment of teachers’ salaries, other current school expenses, and the costs of school transportation; subject, however, to all pledges of the revenues from the taxes heretofore or hereafter made to warrants or other obligations of the County Board of Education of Lauderdale County.