Yes & No, would be the correct answer. The door trim panels are longer on the '77-up. So if your replacing doors...buy the newer ones, if not, you will need to drill a few holes at the bottom & use spacers between the door & trim panel & use long screws. You will also need the '77-up "long" window regulators.
The dash pad is similar, it works, but needs a little help. The gauge cluster bezel will not have the wiper switch hole, depending on which one you get (non A/C), you may be able to cut the hole or use a '81-'82 bezel, it matches the dash pad & has the switch on the dash.
The seat, ect. goes in fine. Lorne