A question about parts fitment

Hi and Welcome to the Forum!  The 77-79 is a different animal really.  There are quite a few differences.  It really just depends on what all the 77-79 might need.  Some parts from the 80-90 will work, but things like front header panel, rear tail light panel, fenders, doors, quarter panels, trunk lid and I believe the hood are all different with the 2-door cars.  You can use some interior parts, but not all of them will fit just right.  It really depends on some skill too.  I've seen people take one or the other and swap entire front ends on, etc...

what about the suspension parts and the exhaust system?

so far as I'm aware, the suspension and chassis parts are interchangeable from 1977 all the way thru 1996. There are minor differences, like the size of bushings in the front control arms, and the transmission crossmember differs based on which year and transmission you have.

nice I think I will try to get the 77-79 coupe just because I think it looks better and you dont usually see some one driving one in the street.And hopefully one day I will make my project thread;).

and thanks for the answers guys its been really healpful

The body itself is the only issue things like body parts , glass (Obviously) and trim are parts that are different from the

4 doors and later cars.