Can you get any maintenance history on it? I'm pretty sure those 3176's have a mid plate under the head and they are always leaking and causing high dollar repairs.
Ya theres better options out there. I got my '98 Freightliner for 4k canadian. with a C12 and 13speed. its only got 600k miles on it too. its a cabover, but totally irrelevant. \you can do better than a 3176 in a daycab.