Super A is running bad

My father has cleared the tank & fuel line of obstructions. It has a real good fuel supply at the carb.
He has taken the carb apart 5 times, cleaned and reassembled. He claims the float & needle are fine. But he never replaced any of the gaskets (bowl & carb-manifold).

I believe by dripping gas into the breather, the fuel supply is increased, richening the air to the point the vaccum leak is overtaken allowing it to run. That's just my opinion from what I have seen.
The manifold looks good & so does the gasket. He never removed the manifold. But he did say the symptoms it has today presented itself "overnight".

I'm thinking of rebuilding the carb & then moving onto the manifold if it doesn't fix the issue.

Any thoughts would be appreciated.

Thanks,
Roy

Have you tried the bowl drain, to see if there's an adequate supply of gas coming into the float bowl?

The problem could be a clogged jet or passage, or a bad gasket between the carb halves, or the venturi could be missing, damaged, or incorrectly installed.

You are correct, oil bath air cleaner. Sorry about that.. Old habits are hard to break..

I'm betting on the gasket between the halves, stuck-float/needle..

My father took it apart 5 times to clean it and re-assembled using the original parts/gaskets. He said he can get a gallon of gas from the bowl drain plug, so fuel is getting at least that far.

First thing I'm gonna do is rebuild the carb and see what happens.

Thanks,
Roy