Respectfully request what to look for when shopping for a used carb

I like my 650 AVS2. I set the air mix and idle screws and haven't touched it since.
Here is a brand new one that is less than $300 with the 20% off code. Makes more sense in my opinion if a used one is 200 and may have been monkeyed with. I think this is the electric choke, the manual choke is cheaper and may work better for your use.
https://www.autozone.com/fuel-systems/performance-carburetor/edelbrock-carburetor-1906/90396_0_0