My avatar isnt my car, I saw it on ebay and thats what Id like to go for paint wise, and just thought it was a nice car. Anyways me and my dad are restoring a 78 2+2 and it had bad rust in the drivers floor, and the other spots I told you about. We had to go find a rust free floor from a 2+2 and I had a friend of ours cut it out then weld it in. Im only 15 so Im having to be careful on my budget so I wont be doing a perfect restoration. Were trying to just preserve the car, so I can find every bit of rust and correct when Im older. But if you will be doing a total restoration youll have to make each layer of the unibody in the back then weld them in to be totally rust free. On the doors, theyre I think 4 inches longer and we had to find new rust free 2+2 doors at a junk yard (lucky). If rust spots are only on the surface you can grind it to good metal then rust kill it. But if it has gone all the way through the panel its best to get rid of all the rust and patch it because it will spread. I think the 2+2 are alot nicer so all the work will be worth it. Hope I helped.