Sounds like either the needle valve is stuck or blocked, or the needle didn't get put back in right... float just determines the level of fuel in the bowl, but the needle valve is what shuts off the flow. If fuel is pouring out of the carb, the problem has to be in that section somewhere... or like Weed said, float pin sticking the float, bent pin... you've got a free flow condition, so sounds like pull the carb, take it apart and check everything again... something is missing,bent, stuck or not installed properly...