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?
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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.