Should I have the head milled flat ??? Anything else I should know ... tricks - tips or anything regarding this job ?

The previous owner told me that the head gasket was replaced about a year or so ago .... I just bought my rig this past August ... this kindof tells me that either whomever did the job last time did poor work .... or that replacing the head gasket on these 2.6L's is really routine .... what can I do to assure a lasting job ?

Too bad I gotta have this thing to drive this winter ... cause I was planning to pull the engine in the spring for a complete overhaul anyways .... or maybe even a cool transplant (was thinking one of my Fiero 2.8 HO V6's with a S-10 tranny and transfer case).