Using Vacuum Guage to Tune

First thanks to all who helped me get this running and a special thanks to Streets. http://www.clubhotrod.com/forums/sho...&threadid=4295

Now that it's running I am using the owners manual to tune my 750 Edelbrock carburetor. I installed a vacuum guage during this time but do not have it hooked to the engine yet. Should I hook it up to the port on back of the carb. or to the port on the intake manifold ? and how do I use this to tune the engine ?
Thanks




Club Hot Rod Rocks:) :) :) :) :) :) :) :)