The following link has some helpful pictures of where the hoses from the charcoal canister go, in case you decide to connect them up.
http://67-72chevytrucks.com/vboard/s...d.php?t=169702
I have an Edelbrock Performer carburetor, and I connected the hoses as follows:
-Manifold vacuum port to distributor vacuum advance
-Timed vacuum port to "carb" port on charcoal canister
-PCV port to PCV valve & tee to "vent" port on charcoal canister
-"tank" port on charcoal canister to gas tank vent
Before I hooked up the hoses to the charcoal canister, my garage always reeked of gas fumes. Now I can't smell any fumes at all.
The following link has some good instructions for using a vacuum gauge to adjust the idle mixture screws (scroll down to the bottom):
http://www.gmcpauls.com/Tech%20Tips1.htm
I live at sea level, and the stock jets and metering rods/springs work fine. I lived in Colorado for eight years and I had to lean down the carburetor quite a bit to get it to run right.