Try and get a better picture. That actually looks more like the OEM casting line. Feel with your finger, you should be able to follow it down and feel the line that goes to the left.
If you're getting smoke and the smell of burning oil off that side of the engine.... Some engine degreaser sprayed on and a garden hose should take care of it. Crankcase vapors blowing out through the broken dipstick tube probably coated the underside of the exhaust manifold with an oily residue. Or just drive it for a while, it will finish burning off.