Nothing looks like a clutch on your car. You should have bought a fucking domestic man. You have the IM (and yes, Ford 5.0's have a 2 piece plentium (upper and lower) and Comp Cams has a air BOX that replaces the TOP portion of the plentum).. but this isn't a Ford 5.0 y0. You can get a Comptech "ice box".. it looks like a stock ait box, but flows a lot better.
The biggest diameter tubing you can use is a 3" Type R CAI, but you need the TB diameter to accept it.
Yes that is the TB, also, since they are into domestics. The newer domestics MAF sensors are in between the air filter and the TB. So they could be what they were talking about. All the MAF is a sensor that tells the computer how much and how dense the air is.