Service Replacement Carb
 

I picked up a quadrajet 17054913 that is marked as a service replacement. Can anyone tell me what I might have and what it's applicable for. From my hunt it 73-74 455 Automatic.
Any help would be appreciated.

!973-74 Pontiac 350,400,455

Thank you.

The cutout areas on the secondary flaps are a big tell. They help enrich the rear barrels to keep from having a lean mixture before the upper flaps open. The holes in front of the square openings is where the fuel for the rear barrels comes from. It was a big help on my Q-jet equipped Chevrolet drag cars to have the front edge of the upper flaps conviently slightly open instead of completely closed. I was never DQ'd in tech for doing that.

That's what that's for. Thanks.