Teddy's steered you in the right direction. Having to choke it like that indicates either too much air or not enough fuel.
You didn't mention taking the manifold off the head -- if not and it ran okay before, it's probably alright there but it's worth checking to make sure you're snug without going nuts on the torque. The other place to check is your fit between the neck of the carb and the manifold. A good gasket in a good snug joint is important there.
As far as the carb. If you're not leaking gas around the seam at the top of the bowl, you're not getting air there. If you didn't fix it. It's possible if you cleaned it up well that you may have cleaned any crud out that was sealing up around wear on the shaft that holds the throttle plate. Did you take the throttle plate offf when cleaning it? Did you get it back in the right direction on the right side of the shaft? (On some carbs there are several ways to put it back that look right but ony one is actually right.)
Could also be your float is out of adjustment or sticking. If sticky, you can sometimes get it free by tapping on the side of the carb with nothing much heavier or harder than the handle of a large screwdriver. If it's out of adjustment you'll have to open it back up and check and adjust as necessary. The proper adjustment will depend on the make/model of carb. And it could be as simple of as one pesky little flake or grain of crud that "got away" and is blocking either the float needle seat or one of the small orifices.
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