Maybe an AFB Carb

The “AFB” stands for aluminum four barrel for the Carter carb line. Even though Holley “now” makes a lot of there carbs in aluminum, there still called Holley’s and not AFB’s.

The one you have pictured is a earlier 4160 Holley spreadbore 650 double pump kind of known as a Rochester replacement due to the fuel inlet location. These are not made of aluminum.