[willowbilly3]

The 7012973 looks like a rochester carb number but most of the older 2GCs had a tag under one of the screws.
It is a very simple carb and you should be able to get close on the year just by the looks. Is it a small base or large base? Maybe you could show a couple pictures of it.

 

[willowbilly3]

The small base will measure 3 1/4" between the bolt holes and the large base will measure 3 11/16". I just went out and looked at some of mine. I have a large base with the style of base plate as the one you pictured. It still has a tag and the number is 7020046. If the number you have won't get you a kit, I'd almost bet the number I gave you will. Most kits are made to cover a wide number of variations in a similar model.

 

[willowbilly3]

After some research, I don't think the 701 number means anything. If it did, the digit 1 would seem to indicate the 50s (3rd digit 2 is 60s anyway) and they never made a large base in the 50s to the best of my knowledge.
Here is some good info but you still need a number.
http://www.holisticpage.com/camaro/parts/carb.htm

and

http://www.oldengine.org/unfaq/leadfoot/qjet1.htm

 

[willowbilly3]

Small base, that would explain the earlier number but according to the 2 reference articles the cast numbers in a circle don't jive. Maybe they had the tag AND also cast the numbers in. Was it a manual choke or is that a modification? Do you have all the missing parts?

 

[willowbilly3]

Factory manual choke would most likely mean it's from a pickup. According to this site,
http://www.carbkitsource.com/carbs/catalog/Chevrolet/Chevy8-1961-76.htm
it would almost assuredly be a CK22 kit.

 

[willowbilly3]

Bummer. I have a couple core large base carbs which I don't have any plans for. If it would help you out, I'd part with one, maybe a trade of some sort.