The Stovebolt Site Forums The Shop Area Engine Shop 235 stalls and stumbles off idle

This engine is a 1957 Chevy 235

Does anyone know common problems related to off idle stumble and stalling?

-New rebuilt Rochester carburetor.
-Engine starts and idles pretty smooth.
-When I snap the throttle, or open it relatively fast, it starts to stall and acts as if it is not getting enough fuel. This is consistent cold or hot.
-The fuel pump is pumping plenty of fuel.
-Checked timing, I'm timed a little advanced (using the bee-bee). It still can be seen in the window.
-When revving engine it misfires.
-Engine ran normally prior to installing professionally rebuilt carb.
-The vacuum advance seems to be working normally. Although it moves to full advance as soon as I snap the throttle before the engine has a chance to rev.

Any ideas on what the problem might be.