You are looking at a Big Block Chevy upper and lower alternator bracket from a 67 Chevelle with 396. The lower bracket is cast # 3878264 but is not stamped with this number. This style bracket set is correct for 65 - 68 Chevelle, Impala, Camaro or Nova with 396 or 427 and short water pump. No pitting. Clean and ready for paint. A good original, not a junky reproduction..