Should I save this 1984 Volvo 760 which has been sitting since 1997?

[igor9212]

I bought a 1984 volvo 760 gle for $650 (Upstate NY)
Last registration on windshield 1997. I am not too mechanically inclined. Sure I can change brakes, oil, basic things, and even that I’m cursing the whole way through.
From previous owner, car spent since 1998 in his garage, out of the elements. Now he has too many projects to keep this one. Frame looks good. Car needs timing done, rear wheels rusted on.
I have never restored a car so I’m sure there are 10 other things that need to be done for sitting so long.

My question is for it sitting so long, and the scarcity of this vehicle, are parts hard to get? Is it even worth it?

Someone said if the timing way way off the valves could be bent and the engine is a goner and to not waste my time with something that has been dead for so long we tried turning the engine. Surprisingly the starter was turning, but engine wasn’t turning. I’m no expert. I just don’t want to dump money into this is I won’t be able to enjoy driving it. Realistically how much would I need to dump in parts to restore a car that’s been sitting 25 years?