72 Demon hood scoop

Here's a great thread that will answer all of your questions:
http://www.forabodiesonly.com/mopar/showthread.php?t=14058&highlight=scoop

And, if you want to build your own fresh air system to seal to the 72 Demon scoop check out my how to thread here:
http://www.forabodiesonly.com/mopar/showthread.php?t=229164