#1 Cylinder seems dead.

First thing you can do is eliminate the idea that it's the carburetor that's utterly ridiculous that it would feed the rest and not one cylinder unless a rat got caught in one of the ports...
And if it is getting fuel and spark and one of the valves is not opening it would seem I thought you would be getting some popping especially if the exhaust valve wasn't opening which leads me to believe the intake...