You will need a host of parts:
I will list a few things now and I have to ru out to diner. I will list more later. LMK if you just change your mind before I list the rest - There is a lot to go into it...
1) Entire front clip:
Wire harness to convert lights to 4 eyes
Hood
Fenders 79-90
Fender Extensions
Fender well splashes - 79-90
Front Bumper Cover - if fog light wanted then 85 - 86 GT only plus fog bracket and hardware
Front Bumper Header Panel ? 79 - 86
No longer sold (junk yard or hunt it down)
Front Bumper Reinforcement - 79 -86
Bumper Shock/crash absorbers x2 ea. front and rear are the same on 79 - 86 cars *confirm, 93 rear will probably work for 86 conversion
All belt molding 85 -86 only if you want GT fog lights, otherwise I believe 4 cyl stuff works
Rear Bumper Cover to match
MORE:
I think of stuff later
Dwayne. BTW, I have an 86GT that I just converted back from 93 front....