Joe is not completely wrong, but the 240bhp engine in our S-Types never went in any Ford! While it's based on the Ford Duratec, which was developed by Ford and Mazda, with some assistance from Porsche and Cosworth, the Ford unit never got variable valve timing, after which it became a Jaguar AJ-V6, not a Duratec.
I understand also that the glorious AJ-V8 engine, as in Joe's STR, was used in other cars including Lincolns and Ford's, more info below and in this link:
Ford Motor Company used this small V8 in other products as well, including the Lincoln LS the 2002-2005 Ford Thunderbird as well as in several Land Rovers and the Aston Martin V8 Vantage.
While I'm sticking up for the V6, the STR is the Daddy, and if you can find and afford one, get it