Floats are too high or you have too much fuel pressure, or both.
Put a thermal barrier between the carb and the manifold.
If you don;t have one, the heat will rise through the carb and boil out the fuel. Since the only place it has to go is into the intake, it will severely flood the engine to the point of a cylinder collapsing.
The Webers are great for this but with them, they will blow the liquid fuel out like a volcanic eruption.
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