This carb is on my wife's 72 Vette.
Carter Quadrajet Carb
In the circle the number is 17059884
and there is two other numbers
1705 8204
2557 BHT

I am thinking this thing is a Checker / Marine carb.
Whats it doing on a Vette???
What the heck is a checker???
Here is a site below to help

http://www.cliffshighperformance.com...carb_ID_2.html