There's no telling which version of the Mustang (or Camaro) you'll have when you show up. However, based on what I've seen on lots lately, I'd say you have a >80% chance of having a basic without a V8 (most likely the I4). However, have a look at what they consider full size. Most common models there will also be found with a 4 cylinder, too (Camry, Malibu, Fusion, Sonata, Altima)