my 63 dart

on my /6 1 bbl carb
i changed the fuel filter . and the whole line cam even the brass fitting on the front.
of the carb and i dropped the needle didnt see it.
found the needle put it back in now car wont start.
i have done something wrong but dont know what i did
will need some help on this 1
i put the needle back in black tip to carb
thanks for the help