<VV> Another question for the experts

[Kinzelman, Andy]

Guys,
You are a great resource - thanks.  
I have another question:  We pulled a good running engine to put into another guys van.  All exhaust stacks showed a nice even tan color.  The topside of the engine also looked clean & dry.  However, there is some oil leakage - it is greatest at the head/cylinder interface of cylinder #3.  It doesn't appear to related to the push rod tubes.  I'd think it is a head gasket, but wouldn't think it'd be oily - given the nice looking exhaust.
Any guesses?  If it is a head gasket, how quickly should it be changed (I'd guess immediately)?
Thanks again,
Andy K.