On the silver mustangs,the engine bay is a light grey.:
I always hated that fact

Exterior paint looks awesome, but when you pop the hood it looks like a crappy dull gray color with no clearcoat.
At least Ford painted everything...even the K-member is painted gray. A lot of other color Mustangs i've seen all have black K-members. I wonder why Ford painted the K-member on silver mustangs to match

:
I did have a guy who came down from MI for me to work on his car ask "Hey why is the underside of your car blue, mines black" when he had a black car haha.
Ya coulda just asked 

Glad its together, now go have some fun!