Just go get another carb.
Tlowe offered you an assortment of carbs to you,probably for a good price. Quote:" I have lots of never to be used 1 bbl carbs"
Another member here offered to send you a working carb.
Throw that junk carb to the side (& play w/that to your hearts content) & use a known working one.
Sometimes,a carb will just go to junk after a simple rebuild.
Caused from a simple piece of debree stuck in a passage that just will not come out no matter how many times you carb dip it,blow it out w/compressed air,,believe me ,it happens.
My two cents thrown.