Any political subdivision for which the commission is created may issue its general obligation bonds in the manner provided in the Public Finance Act (§ 15.2-2600 et seq.) in furtherance of the establishment, construction and enlargement of a hospital or health center. All such bonds issued prior to June 1, 1975, for such purposes by any political subdivision are hereby ratified, validated and confirmed, and all proceedings taken prior to such date to authorize the issuance of bonds for such purposes by any political subdivision are hereby ratified, validated and confirmed, and all such bonds may be issued pursuant to the Public Finance Act.