You figured GM would have made Vette engine top of the line with flat plane V8. I like it that Ford beat them to it for GT350
The "flat plane" engine is harder to "balance" (remove vibration) then the "cross plane" engine. The bigger the displacement, the more difficult the task. The Corvette has generally used high displacement engines to generate high torque numbers. The cross plane engine typically creates more horsepower at higher then usual RPM but doesn't generate the big torque numbers because the displacement is usually smaller.
2013 Mustang GT Premium Convertible
Candy Apple Red, Auto, FRPP Tune, GT500 Axlebacks, KONI Yellow Sport (adjustable dampers), FRPP Front and Rear swaybars, Custom Removable 4 Point Roll-Bar, BOSS 302 Low Expansion Brake Lines, Roush side splitters, GT500 spoiler, Redline Tuning hood struts,18" Ford Chromed Aluminum Wheels (9R3Z-1K007-A), Michelin Pilot Super Sports - 235X50X18
2011 Mustang V6 Premium Convertible - Gone