Its pretty uncommon for a head gasket to leak to the outside of the engine. The only engine I know of that does that regularly is the Subaru EJ251. I suspect you might just have a leak with the heater hoses or similar.

If you do determine its a head gasket putting a machined and rebuilt head on is nice but that can be costly. I have done a number of top ends where I just checked the head with a straight edge, lapped the valves, and threw it back on with new seals. Things I would do while in there include cleaning the deposits out of the intake manifold, timing guides, timing chain if stretched, check the water pump and power steering pump for play, convert the belt tensioner to a spring loaded one m104 one if you don't care about AC like me, change the belt, replace all the cooling lines and seals, and do the power steering lines. All the accessories on the drivers side of the engine are tight in there and suck to work on.