First, that is not a 67 hood, 67 had only "flat" hood, no bulges
Second, "GT" was a cosmetic and interior package, bucket seats chrome, etc. You could even get a slant 6 GT
However your pictures are very small, but I do not see "GT" chrome which in 67 ran front to rear all along the fender/ door/ quarter "break over" point. So if it is a GT the chrome may be removed, I just cannot see it in photos.
I THINK all 67 GT (may be option) also had a wide chrome strip under the doors, and I do not see that on yours, again, could have been removed. Repaint, bodywork, etc
GTS in 67 was a 383 (big block, distributor in front) and can be verified by VIN
If it's a V8 and has distributor in back, you will have to look "further." Stock V8 in 67 was 273, but someone may have swapped in a 318, 340, or 360
EDIT: I keep finding Google pics with power bulge hood am I wrong about that? Anyhow here's a YouTube vid of a 67 showing proper 67 GT chrome. This one however is a GTS with 383 IF it is original
