Fuel pouring out Edelbrock - why?

paulclark said

Working on this new-to-me Edelbrock carb on a 66 Dart with 273. Starts and runs but pours fuel out the rear power brake vacuum port. When I plugged that, it began foaming gas up out of the vent holes outboard of the right metering rod.

Never saw this happen before but I bet someone else has. Sunken float maybe?
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Needle and seat not closing.
Could be too much fuel pressure, a bad needle and seat, or something stuck in the needle and seat.

The very first thing I do in this situation is pinch off the fuel line with the engine running, and when the engine starts running out of fuel I unpinch the line.
Sometimes this can rinse out the needle and seat if something was caught in it.
(Common with rubber lines to get a little piece of rubber in the needle and seat, especially when the lines have been recently disconnected and re connected)

If nothing has changed with the fuel supply that could cause an increase in pressure, you are pulling the top of the carb off and inspecting/replacing the needle and seat.