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There is a long shopping list of why a Model A wants to jump out of gear. Part of it is the fact the gears are straight cut as opposed to being helical. There are also a number of things internal to the transmission that can cause the problem. However, there are two easy things to address without removing the transmission from the car.
Check that the two metal spacers are inserted in the two ears of the clutch housing where it attaches to the engine block. The spacers are brass and are .010 thick. Their purpose it to properly align the housing to the drive line of the car. They should be the same thickness as the gasket installed between the housing and the block. If they are missing they can be easily installed. Bratton has them in their catalog.
Next address the transmission tower. If you have access to one from a car that does not jump out of gear, try it on your car. You can also rebuild your tower without having to pull the transmission from the car.
Tom Endy