The engine ran to start with ,unless the tank or carb was just full of crap I doubt it is plugged off completely however A weak spark can stop it from running , I know you say you have spark but do you have spark under compression??? Spark fuel and air is all that is required, you just need to find the one or ones that is giving you problems. Even if the reeds do leak a little they will still run, but it's an easy check to see if the filter screen has build up on it. Oh just for fun check to see if the Needles are set at (APPROX1-1/2 turns) for a first time start up, then adjust as needed later. You may also try this with the aid of a helper turn the plane over and prime the carb a little, close the choke then return it back to upright flip it a couple of times then open the choke add some fire and see if it will go then.
Just because it's dripping gas out of the carb does not mean that gas is getting up to the cylinder and on top of the piston to burn and fire the engine.