Put it up on craigslist for $7,000. It'll eventually sell. Any more than that, and he will be sitting on it for a long time. Whoever buys it will have to trailer it, or spend a weekend getting that it running and MAYBE roadworthy.
I paid $5,000 for my 318 a904 7.25 2.73 68 fastback back in 2015 and drove it from Eugene OR to Napa, CA. It came with a free mummified field mouse and a ton of pine needles.