Carter BBD help

I recently purchased a super 6 intake and carter bbd as a set and started to take the carb apart however it is completely seized and I can’t seem to get it apart, which brings me to my question has anyone ever used one of these Amazon carbs ( https://www.amazon.com/dp/B08DDCM84B/?tag=fabo03-20 ) and if so how was your experience? That or does someone have a Carter BBD that is good to go they are willing to sell?