The above question is important. Your carbs can not handle more than 2 PSI. Over 2 PSI will cause flooding, from a little to a lot depending on pressure. Most electric pumps are set at 4 PSI, so are not suitable for your carbs, without a regulator.
The mechanical pump on the 7 can produce more than 2 PSI if the pump with the long arm is fitted, & the 3/16" spacer is missing from between the pump & the engine block. The closer to the block the pump, the higher the pressure.
Old needle & seats in the float bowl are not good as shut off valves. When the engine is stopped there will be some residual pressure in the hoses from the pump to the carbs. This will slowly leak into the float chamber causing an overhigh float level. The excess fuel will run just by gravity through the carb jet, & lie in the carb throat, as in your photo. This clears when the car is started, & the carb will not flood while the engine is running. It uses more fuel than will leak past the needle& seat.
The fuel pump should not pass fuel when stopped. However if there is dirt or silt in the valves a very full fuel tank can cause some fuel to pass them to the carbs, & cause the same flooding. This is not common.
To test any of this, next time you run the car, immediately you stop the engine, remove a fuel hose from one carb. A small amount of fuel will squirt out as you do, reliving the residual fuel pressure. Refit the hose, & check a few hours later. You should not find any fuel in the carb throat. If so, you now know why it's been getting there. If this is all it is, it really doesn't matter, unless it makes the car hard to start. It will clear as soon as you start the engine.