Checking the Internet:
Attached are the Delco Rochester 2G Spec Sheets for the 7023010 that you asked about.
The listing provides part numbers but no other details (jet, bore and venturi size etc.).
Sometimes more information can be found in the automobile's service or shop manual.
A 2G is most likely for a truck and not a car (2GC or 2GV).
Other websites where some have asked questions about the 2G:
https://www.inliners.orghttps://www.jalopyjournal.com I'm plagiarizing from Jon's (carbking) post here:
There is a partial chart in the book "Rochester Carburetors" by Doug Roe. If you acquire the book, and check the chart, you will note varying CFM's for different internal venturi sizes for the different size throttle bodies. There are some internal venturi sizes not listed.
If a chart showing all Rochester carburetors and their internal venturi size exists, I have yet to see one.
Remove the airhorn (top casting), remove the venturi cluster, measure the internal diameter of the main venturi, and then consult the chart in the book.
Also there is this information:
The 2G carbs came with two different flange sizes and 5 different CFM ratings.
1 1/4" flange , 1 7/16 Bore x 1 3/32 venturi = 278 CFM.
1 1/2 Flange carbs all have 1 11/16 bores :
1 3/16 venturi = 352 CFM.
1 1/4 venturi = 381 CFM.
1 5/16 venturi = 423 CFM.
1 3/8 venturi = 435 CFM.
All ratings @ 3.0 in HG.
Jon gave this CFM calculation example which happens to include the 283 2 barrel.
https://www.thecarburetorshop.com/Carburetorsizeselection.htm Also CFM ratings:
https://www.thecarburetorshop.com/Carbshop_carbsizesandCFM.htm
