displacement will be with the camaro; that's just the nature of the LS. its the best big displacement OHV there is. it will have good N/A TQ because of that. the way the mustang will compete is with an advanced smaller displacement DOHC engine which can make the same HP but less TQ because of displacement. the other way Ford will compete is to offer twin turbo engines, either in the duratec 6 or 4. they need to keep weight lighter and improve the interior, which if you've seen the latest interior shot, i'd say they've done right on:
Ford does have a 6.2L engine, the Boss Engine. for now, it is a SOHC engine and will see its first duty in the Raptor:
they do have the displacement, but they are going a different route with the 5.0 DOHC in the mustang. more to come