Fuel into carb doesn’t mean a problem with car. The mechanical fuel pump that feeds fuel into the bowl is more suspect. The passageway on carb is nothing more than a passage way with a mesh filter. If no fuel enters bowl you need to inspect fuel pump on block and hardline up to carb.
Is this a factory Aisan carb or aftermarket such as Weber?
High quality aftermarket 2F / 1.5F carburetor for desmogged applications. Same as OEM part # 21100-61012. Made by Fuji Japan. Guaranteed quality assurance. Notes: If your vehicle is 1976 or newer and your vehicle is registered in California or other areas with smog check requirements, you...
With the availability and price of stock Aisin carbs, it's well worth your while rebuild it. If it's a Webber, you are already desmogged so might as well put a Sniper 2300 on it or get the cityracer carb.
I would get a rebuild kit and pull the carb apart... You could try just taking the top off, removing the float, and checking the needle valve... If I was seeing nothing come into the bowl, I would personally rebuild it and make sure the body has a good soak in carb cleaner. Or send it to Jim C or one of the other mud vendors to get it rebuilt
Unless you have a physical obstruction in the line then you likely have a float or float needle problem. The float needle could be stuck closed and this would prevent any fuel from flowing into the bowl.