need a new engine, new to the site

So I am interested in buying this guy's B Series, extended cab. I'm not very knowlegefull of this truck and was wondering if it was solid or had a lot of problems? He's selling it for 700 and the only thing that seems wrong about it is water leakage...which I'm thinking is an engine issue, not too sure. It has a nice sound system worth about 500 itself and so I would pretty much be paying 200 for a truck with some water leakage.

any help would be appreciated, thanks.

Do you know more information on the truck like the model is it a B 2200, 2300? What is the year, or the engine it has in it? Certain engines are known for different things lol

water leakage could be something as simple as a loose rad hose or as bad as a warped head from overheating