Those 230-250 engines are really tough, and can go a long way. But intake leaks and cracked exhaust manifolds are pretty common. Also, most oil leaks seem to be the valve cover gaskets and bent hold down holes.
Speaking of valve covers, your engine doesn't have the "Chevrolet" script on the valve cover. Possibly a replacement valve cover? GMC? Another GM car?
It doesn't matter, just interesting.
