http://www.stovebolt.com/ubbthreads/...gonew=1#UNREAD
Currently on the Stovebolt Forum is a very detailed thread on what Carter carbs will fit on Chevy engines....and ethanol issues on carbs...... not sure if the link above will work for you.
Look for the Stovebolt forum Engine shop....YF Carb. Interesting reading.
You may need to sign up but it is free and similar to MLU ...very helpful individuals
Bob