Guess the 2015 5.0L Coyote / Mustang GT HP and TQ Numbers

As you all know, Ford has teased us with the 2015 Mustang GT specs by letting on they the 5.0L V8 Coyote engine will output at least 420 hp and 390 lb-ft.  But, just how high will the final figures be?

Our members have challenged each other to make the most accurate guesses, so what’s yours?  Share your best prediction INSIDE.