Zenith over flow

Allis C. I’ve tried it all. Carb has been cleaned with Berryman cleaner. The body also soaked in evaporust. Added inline fuel filter. Float height is good and floats do not hang up on side wall. New gasket under float needle seat body. I even removed the wire clip between the float and float needle. Tried different needles.
Only thing left is buy several needles and seats in hopes I get a good match.
I’ve read the aftermarket carbs have poor performance. Is a Marvel carb an option?

No I checked that also. If I blow into an empty carb bowl it holds holding upside down. As soon as it overflows I disconnect fuel line from carb and attach a hose and blow it appears to hold but under gravity feed it overflows as soon as the bowl fills up with fuel valve open. I measured the original needle to be a few thousands larger than the new needle thinking it gets kicked to side of dead center into seat hole. Sad because this tractor has been completely taken apart and overhauled from lower drive to engine.

if you have tried several needles and they all leak, then i would lower the float like Les said..

what skip said   set just the bowl level with the nozzle in and carfully and slowly fill it with gas and see if their is leaks bottom of those bowls can crack if they have had water in it and froze , but the nozzleis probley leaking at that gasket,  0if the float is good  and the seat is polished  

Skip, W.Pa wrote: I have had  problems with the main jet discharge tube gasket leaking. Some were not tight enough and leaked at the round gasket under shoulder. Some the gasket dried out from sitting extended period with no fuel in carburetor. Makes you think it is a needle seat / float issue. When it leaks gas will wick it's way up past gasket and drip out the bottom of carburetor when tractor sits for period of time. Something to look at when you take carb apart.

To be clear. I’m observing the gas overflow with oil bath cleaner off. I’m looking into intake of carb. The gas appears to be coming from upper area of what I believe to be the main jet feed. A cascading effect getting surface wet. In very short time gas runs out hole positioned at about 2 o’clock inside carb intake throat.
I’ll admit I have not pulled the long brass tube ( I believe to be main feed) I’ll need a deep well socket for that. I can definitely see that gasket leaking but to have gas rise as high as needed to run out the 2 o’clock hole in intake it must be over filling. Filling bowl with gas does not leak nor does the gasket between two halves. Gas runs out intake throat.