Definitely a repaint.
That's an 84-85-86 base coupe. Or maybe a pre-86 SE.
If it has the flat decklid, with the vent grid in the center, it's probably an 84.
If it has the bump in the middle of the decklid, with the vents on either side of the bump, and no brake light in the back window, it's probably an 85.
If it has the bump in the middle of the decklid, and has the brake light in the back window, it's probably an 86.
Or it may be a FrankenFiero.
Edit - Sorry. I just reread your post. If it's an 84, there are not a lot of parts that will be useful for an 86. It also would not be a good candidate for a V6 transplant, since the 84 never came with a V6. Lots of wiring changes after 84. Among other things.
[This message has been edited by Raydar (edited 10-18-2017).]