Initially, the GT was to be supplied with a specially-made V10, which would be based on the existing Triton V10 seen in the Ford F-Series Super Duty trucks and the E-Series Econoline vans.
True, there have been V-10-powered Ford pickups in the past (remember the Triton?!), but not ones meant exclusively for performance. A purpose-built hot rod, the SRT-10 could burn rubber ...