oil leak help Options

[captb]

for a few months now i've been leaking a few drops of oil a day. nothing major but i finally got time to look for the leak today.

what i found:
1) there are signs of oil reaching just below the cylinder head. only on rear side of engine though.
2) i cleaned underneath and ran idle for 10mins and didnt see anything.
3) #3 spark plug had oil, but not on where the spark comes from, mostly on the threads and head.
4) there was some oil in the distributor cap.

car info:
1) 125,000miles
2) never touched engine bay for minimum 4months

im thinking it may be the head gasket, or does my engine block need an overhaul. all help is appreciated.