Mustang GT350s Engine is one very powerful engine with its just like the Mustang GT350Rs engine. see for explanation of this engine too.
Model Year Engine Power Torque Compression Ratio
Mustang GT3502014-5,163 cc (315 cu in) V 8533 PS (392 kW; 526 bhp) @ 7,500 rpm 582 N⋅m (429 lb⋅ft) @ 4,750 rpm 12.0:1
The Shelby GT350 version uses a modified version of the Coyote engine, code-named the Voodoo, that features a displacement of 5.2 liters with flat-plane crankshaft instead of the traditional crossplane.