I assume you mean cowl induction hood. It really doesn't work all that well. Mine ralely opens up on hard acceleration, unlike the one shown in the video in one of the posts. The vacuum line hooks up to the intake manifold, same place the brake booster and transmission vacuum line go to if you have an automatic. You may have to buy a new fitting that allows for the extra line.
Here's a few posts
http://www.chevelles.com/forums/showthread.php?t=471433&highlight=cowl+induction
http://www.chevelles.com/forums/showthread.php?t=391631&highlight=cowl+induction
Here's a few posts
http://www.chevelles.com/forums/showthread.php?t=471433&highlight=cowl+induction
http://www.chevelles.com/forums/showthread.php?t=391631&highlight=cowl+induction