Duratec HE is a 16 valve DOHC I4 that represents the next step after the Zetec.
The SVO Mustang/Thunderbird TC/XR4ti 2.3 were 8 valve SOHC motors derived from the old 2.0/2.3 SOHC motors.
I doubt any of the SOHC 2.3 turbo stuff is going to bolt onto the Duratec HE. It is 10-15 year old technology anyway...
