Dean,

Pouring all the fuel on the floor would mean the float and needle are not shutting off the fuel flow.
Floats are not normally part of rebuild kits, but there are two areas to check.

First, If you have a fuel pump, it should be connected to a fuel regulator, otherwise there will be too much fuel pressure and will flood the carburetor. Pressure should be between 2-3 pounds.

If you don't have a fuel pump (these were not stock) remove the bottom of the carb and check to see if the float is either flooded or has tiny pin holes. If flooded it will be heavy with gas. Second the float moves a pin up and down, when the pin is fully up the fuel flow will be closed. Your rebuilder should have noticed if the float was flooded, and the pin is normally replaced.

While you're at it, check the Vacuum tank for leaks or cracks.

Rick

Where Are You From? Fremont, CA

Do You own a car built by Durant? 1929 Model 60 Roadster & 1931 Model 619 Sedan