You are looking at a vintage pair of Big Block Chevy Valve covers. They are marked on the underside “CHEVROLET 739”. I believe the to be Ansen? This style was used on the Baldwin Motion cars. These were polished but have some dull spots with nicks and scratches. No chips, cracks, pitting or extra drilled holes. I don’t think they will ever be show quality but will look great on your survivor car.