To try to return to the original topic, the engine type wasn't necessarily model-specific, it was more time-specific. When DeTomaso ran out of Clevelands, (and I've never seen anything definitive as to what serial number this occured... somewhere around 1988 I think) they substituted the Windsor... So anything built after serial number 94XX received a Windsor, be it GT5, GT5-S, or GTS.
And I can't add much to what has already been said regarding the squared-off engine bay... When Ford and DeTomaso divorced in '73, Ford, in a moment of spite, destroyed the tooling required to stamp out the car, figuring that DeTomaso wouldn't be able to continue manufacturing cars without the tooling. So instead of stamping out that area in one large die, they had to fabricate the area, welding panels together, more or less. Hence the straight, welded panels in the later cars. Again, it isn't model-specific, but instead when Alejandro ran out of stamped panels, everything from that point on was manufactured, regardless of model.
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