I'm waiting impatiently for Jerry to chime in with his "ABC's of Carburation - Always Buy Carter" thing.
Happily, my engine came to me with a Carter carb on it.
Carbking posted a thing on Rochester carbs how the body gets warped and how to correct it. Maybe that's what's up with yours.
[on edit] It was JonG that posted the deal on straightening carb bodies. The "other" Jon.
Here's the thread: Link
That one that Chevy's of the 40's sells LOOKS like a Carter, but ???