Adjusting Idle Mixture on the WCFB
Idle mixture is an important setting on a carburetor, and most people don't know how to do it. What you're trying to do is set your carburetor's idle circuits for the most efficient operation with the least fuel.
There's no better tool for doing this than a vacuum gauge. It can also tell you a lot about the health of your engine; it's really an invaluable tool. For a great walk-through of how to use a vacuum gauge for diagnostics, check out this tutorial from Greg's Engine & Machine, of Copley, Ohio.
But for setting the idle mixture, there's nothing like actually seeing it done. Here's a short video tutorial I put together, showing idle mixture adjustment using a vacuum gauge on my '63 Lark with 259 and WCFB 4bbl. As you'll see, it's simple and fast - all you need are a tach, vacuum gauge, wrench and screwdriver.
Now go get 'er done!