I don't know what is involved in fixing the headliner, I don't know if it's a major job or not. Okay, I'll let the cat out of the bag I was going to use the headliner and the wrong seat covers as a bargaining tool, guess that I had a bad idea
You're joking right?
Seriously, you have to be kidding. There's literally not a single picture of the ENTIRE trunk inside or out, it's got some weird alternator, one of the exhaust pipes is welded together in 6" sections, half the hoses and wiring in the engine compartment are over sprayed white, which means it has a cheap, WHITE, paint job. And with all of those things clearly pictured, you're worried about the headliner, which is better than 99% of headliners out there. And, oh, right, the headliner literally has no effect on how the car starts, stops, or steers, all of which should be higher on the list than the headliner, because who cares?
I mean, if I was in the market for an A-body and I liked '69 Darts I would absolutely drive less than an hour to go look at it, because all that stuff might be fine and if it is then the price isn't outrageous. Especially if all the stuff not pictured is actually as solid as what is pictured. And even if it turns out not to be your cup of tea, you've looked at another A-body in person so you have something to compare the next one you look at to.
But if you looked at all those pictures and thought the headliner was the bargaining chip, you should take up needlepoint. The classic car thing is not for you.