65 Dart Help Please

Do we know for certain that the float is, in fact, cracked... and has become a sinker?

I have had the experience of the tiniest bit of crap make it through the filter, and get stuck in the needle and seat... thereby preventing the the needle from seating... engine won't idle... floods and dies.

Don't even need to take the carb apart to check that.

Bottom line on the float... if it's cracked... it's probably toast.