Check some of the other subtle GT details, like the twin exhaust brackets in the frames, & the wiring through the radiator panel.
Am not 110% convinced about the VIN stamping being 110% legit, in the photo it looks uneven to me, I have heard rumours of numbers supposedly being changed by being beaten out then the panel re-stamped. If the data plate was an original matching then of course yes, but it's not.
So caveat emptor.
But it's a nice looking car in the photos, factory GT or not.
Hope we haven't completely put the OP off by now, but these dialogues are important.