65 mustang 289?
Yea, sounds like a good deal. BUT, why did it sit in the garage for 10 years? What made him park it? Really?
You didn't say how the interior was. Just pray you don't need to replace the headliner.
I picked up mustang that was setting for 8 years. I wound up having to replace the whole fuel line, couldn't remove the buildup from setting so long. I also had to pull the tank and clean it out. Cleaned up the carb. Changed the oil Bled the brakes. Flushed the radiator. Didn't do anything to the trans (C4) or rear end -- worked great. Put air in tires.
I sure would be nice to hear the engine run, not hearing that could be a problem if he's spun a bearing and not disclosed it to you.
Still, sounds like a good deal.