Wow, another 1973.5T survivor..............
No doubt your car will sell for a much higher price if it were put it back into original condition. That is, interior components and exterior. But the question is, do you want to put the $$$$$ into it and hope you get a decent yield?
I would say that Techweenie's estimate may be correct here for this car. I figure it would take about 15K - 20K to get it back to original condition including paint! Many of the existing components like seats, exterior mirrors, etc, can be sold for a decent price.
The BIG question is - do you want to take the time and $$$$$$ (and risk) of undertaking this correction or just sell as it is?
As she stands if you stay firm on what Tech recommends (30K range) you will sell the car. Stick with your price!!!!!!!
Take a look at a prime 1972T coupe on the FOR SALE page. The one that's Sepia Brown. His price is firm at 80K! Granted its perfect, but when you consider 30K versus 80K that's a 50K range. That's why the consideration for investing some cash into it to get more might be a good option.
A total restoration can be as high as 100K.
Good Luck.................
Bob
1973.5T Sepia Brown