Holley 750 Alky Alcohol Double Pumper Carb. ID plate on the side is inscribed #528 - 750 - ALKY. The style of the plate on the side is akin to those used by C&S Carbs. Whatever sticker was on there is long gone with only the inscription remaining.

Butterflies open and close smooth, and there is no visible damage that I can see. Good core for a rebuild.