If it ran 18 months ago, no reason it should not run fine now, assuming it really was just the battery which you know better then us. But like bikesmurf said, put some marvel mystery oil in each cylinder and let it soak. That can avoid damage trying to turn it over the first time. Mine sat well over 7 years. I can verify not running for 7 years based on old posts on this site when it was first sold to 2 PO's ago, and no one had stated it till I got it. Runs fine now.
Vehicle is got some rust, nothing that would scare me. Sine you know it ran, and know a little history 2k is probably the high end I would pay, but would probably expect to get it for less then that. There was a 76 near me on CL for 2,900 head pulled off and motor rusted beyond repair, similar rust to this one. But it was a 1 owner, complete including sales documents, books everything that it rolled off the lot with when new, plus a PTO. He could not sell it, put it on ebay and got 3,800. South east can be crazy. Bottom line it is worth what you are willing to pay and be happy with when you see it at your house. In some areas availability of them is few and far between and waiting for a better one not always a good option.