I don't think you are looking at the correct model BBK kit for your car...
IAC stands for Idle Air Control... I'm sure you can see that NOT hooking this up would be a bad thing....
Go to
www.summitracing.com
Take a look here and enter part #BBK1718, which should be the correct model for your car...
Click on it and you'll see that the BBK ALSO has inputs for your IAC and ventilation...

__________________
Uncle Sam
"What the hell is up with all the gauges?
Calling Captain Kirk, your ride awaits... Phasers on stun...."