Could you get the GT option in a Notchback? There is a member here on H-body.org who has created a GT from a Nothback - it's a really good-looking Vega - but I don't think it was an original GT.
This 77 Vega has tremendous potential if the condition of the car is a good as it appears in the pics. Black over tan is a good-looking combination, too.
Other options are power steering, a 5-speed perhaps?, and air conditioning. From your other photobucket pics, it looks like the A/C compressor is missing, though.
Also, the badges don't look original to the era. Something added later.
Jim is correct about the engine color - my 76 is orange and my 77 is blue(no pulse air, though, but could have been removed by previous owner).
But, it looks like the engine in the 77 Notchback was rebuilt judging by the bright, shiny orange paint on the block and valve cover - the head is painted black
.
If it has a clear title, is not rusty underneath and it runs, steers, and stops, I'd offer at least $750.