Not sure what I have here or what it is off of, other than a Pontiac.
On the backside ^^^^^ it has the following CAST into it; a circle with 7037576, another smaller circle with A43, an R in a circle and a C in a circle.
On the side where we normally find the carb number stamped it only has the following stamped into it; 4951, E3, and a C in a circle that likes like a modern copyright insignia. VVVVVV The E3 is over the hump on the pad that you can see in the photo.
Any information as to year and original application would be appreciated. I'm thinking '67 full sized Pontiac with California A.I.R. calibration but have not been able to find any information at all other than a few random mentions else ware on this site.
TIA
JIM