The carbs sound like "mystery carbs". Do you have a known good running carb? If so I'd try that one, just leave the 2nd carb with throttle blocked shut.
If you dumped TOO much gas down there it might be flooded.
Let it sit a while, then give it a shot of starter fluid down each carb. (I'd do this outside and have a fire bottle nearby too. usually it's fine but sometimes starter fluid misbehaves.)
