Slicknash

I'm building a turbo lt1 for my street rod and will be using an older fast classic ecu.
Fast claims I need to use a remote iac but the tech I talked to couldn't tell me why.
What iac are you guys using on your forced induction applications?

This is the first turbo engine I have built and the first fuel injected motor I have had in a hot rod so this is all new to me and any help is greatly appreciated.

thanks.