The several Persons who at the Time of the passing of the special Act are Surveyors of Highways for any Township, or other District within the Limits of the special Act, may proceed for the Recovery of any Highway Rate made in such Township or District, and then remaining unpaid, in the same Manner as they might have done if this and the special Act had not been passed, and they shall apply the Money which they so recover, in the first place, in reimbursing themselves any Expences which they have incurred as such Surveyors as aforesaid, and in discharge of any Debts legally owing from them in respect of the Highways within such Township or District; and the Surplus, if any, arising from any Buildings or Lands within the Limits of the special Act, or a proportionate Part thereof, shall be paid by them to the Treasurer to the Commissioners, and shall be applied to the same Purposes as the Rates by this or the special Act authorized to be levied are directed to be applied.