I would agree $2850 is in the ball park. Although you may need to be prepared to discount further. There is just not a lot of buyers for a 45 year old car that has no ac, no power windows, no power door locks, and limited performance and reliablilty.
If you search the classifieds there are a ton of 20 year old cars for about $2,000 that have more modern conveniences, better performance, and economy for around $2,000
It makes for a hard sell to young kids and others that are on a tight budget. Comes down to finding someone that has an emotional feelings for a car like yours.