Barn Find!
Not all eliminator so were high performance cars. Some had 351 Windsor in them, some had the 302 and the 429
I know where a black 1970 eliminator with orange stripes is at in Florida and it is for sale. Have not seen it in person only pictures.
They are not worth anywhere near what a boss mustang is worth, unless with the hottest engine in it. Then still not boss mustang $$$$$$$
I had a super clean 69 Cougar with a 351 2 bar. Auto 52,000 miles original interior that was close to show room new, sold it for $ 11,000 a few years back
Just like the others have said, knock on the door and see what is up with the car. Don't say eliminator, just you seen the old car and that you have interest in old cars and like to find out about them. Even if they don't want to sell it, they might want to get it running and if you have time and ability offer to give them a hand if they need it.
I like them and wish I had kept mine longer than I did. Had it for a total of 15 days. Beautiful car, drove good they are nice cars.