[Greg Jones]

If you have consistent spark at the plugs, then you must not be getting fuel. Make sure your carb float valve needle is not stuck, and that you are getting proper fuel flow into the bowl of the carb. You can check this quickly by unscrewing the bottom half of the carb, then opening your fuel valve under the dash. If you get a flow of gas that is a good sign. (You should do this outdoors, in the driveway, and only long enough to confirm flow.) Make sure your fuel line is not "pinched at the end" where it screws into the carb. Make sure the fuel line does not protrude too far into the carb at the fuel inlet port. This all assumes the carb is a stock Zenith. You could also have a plugged jet in which case you will have to investigate.