yep plenty of room for a HUGE IC
Trick made one that the grille actually mounts to. very sweet part but a very big price tag of 1300-1400 i cant remember (JUST IC)

 

Just to answer one of your original questions, if you check the glove box RPO sticker you will be able to figure out what engine RPO you have.

But you can probably guess right if you know a couple things like if it's aluminum or flex fuel equipped:

LH6 - Aluminum block non flex fuel
LC9 - Aluminum block flex fuel
LY5 - Iron block non flex fuel
LMG - Iron block flex fuel

 

Thank you sir