The best way to get a BHG out of the way is to do a block test. If it's negative, you know it is a coolant line somewhere.
There aren't any coolant lines near the intake manifold that I know of. The ones in the back of the head are annoying, and there's another smaller one underneath the power steering resorvoir as well.
Assuming it's not a BHG, or if it is and you plan on fixing it, replace ALL the coolant lines, double check your work, and don't worry about them for another 20 years
