^ This
To add to what AA said, a new engine is the minimum you're looking at. Odds are that an owner that let an engine get to the state this one got to cut corners elsewhere and you're going to start finding all sorts of other issues.
Life is too full of headaches already without buying one from someone else.
Here's the other thing, they're not cheap to own & maintain if you don't cheap out. I've spent as much on my car this year (clutch, exhaust & new tires) as you're looking to pay for this one. Don't risk putting yourself in a financial bind.
Welcome to NICO!