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Well, not familiar with the similarities/differences between the 28 and 33hp hp carbs, but you can’t even get the engine to run continuously at low speeds, where the nozzle/jet/needle is not an issue. The only other thing that concerns me is whether or not the 33hp models of that vintage used an adjustable high speed needle, or a fixe high speed jet. BUT, I’m guessing you would not have been able to thread your adjustable high speed needle into that carb bowl, if it was meant for a fixed high speed jet.
Have you tried to continually pump the fuel primer bulb while the engine is running to see if that will keep it running? I’m thinking this issue is something relatively simple. Tell us again what you did to this engine mechanically. Needless to say, the cosmetic work you have done looks amazing. I’m also assuming it has never run correctly after the work you have done to it. Did you run it before doing the restoration work? If so, did it run “OK” then? I’m thinking you have checked float orientation and that is OK, but that could certainly explain things.
Anyway of doing a video the next time you run the engine? I’m hearing you say that the engine seems to run “OK” while it is running, but dies after 5-10 seconds of run time.