Well, I hate to scrap cars but in reality you can't save them all.
I scrapped a 1968 Mustang coupe too that I bought as a parts car. It was a T code too that had been left in a field for 11 years and sunk in the ground to it's axles/floor. The bottom 3-4" was heavily rotted away and it split in half with only the A pillars and roof holding the halves together. This had been a Northeast car it's whole life too and was discarded in the field in 91 or 92 because of it's poor condition at that time. Cars aren't cheese and they don't get better with time!
Do I feel bad scrapping it? No, not really. While with the repro parts on the market it *could* have had both halves put on a jig and then reconstruct the car but it was beyond my skills and wallet to even consider resurrecting this car. Nothing special or rare about a Lime Gold/black interior 6cyl coupe with a vinyl roof and AM radio as it's only options (I did pull a Marti report on it for curiousity).
I picked that car clean over a 2 day period and filled my Chevy wagon with parts that were still good or salvagable. Took most of the glass, wiring harnesses, trim, trunk lid, hood, dash parts, heater box, tail lights and all the odds and ends that nickle and dime you like screws and clips. The seats stayed since the mice and other critters had gotten to them. The wheels and suspension stayed too. I had no interest in 6 cyl parts plus I had to leave some parts on it so I could get rid of the carcuss for free. Plus I didn't want to lay in the mud trying to fight the dirt and rust while worrying about the car collapsing on me trying to salvage the C4 or anything else under there! The doors were rusted bad and they stayed too plus the front fenders and grille were completely destroyed since the car was pushed into the field with a backhoe originally. The horns weren't damaged and I took them too.
Well, that's a bit of a story but hopefully it will make you feel better and realize with what I had mentioned before that some cars just shouldn't or can't be saved and don't worry about it. My parts car helped me with my other 68 and a 67 of a friend who needed some parts for her car.
Sad day for a 1968 mustang. 
Sadly, even with good floors and stuff , a 68 T code coupe is the low man on the totum pole for market value. If space is not a problem you could keep the stuff that's good from the interior. If the doors don't have a bunch of rust, you could probably get something for them. If you ebayed everything on it that's worth anything you might be able to get more that way than you could by trying to sell it straight out. Hope that helps.
