Thanks for all the info. Yes, it only makes sense to get the head checked before putting back on, especially since this is one of the originals. There were a couple of other things mentioned, like a leaking bellows over by the turbo, but all they mentioned was minor compared to the head gasket.

I'm going to monitor the trans fluid for the next little while to see how bad the leaking is. The trans gasket had loosened up and it was leaking around there, so I don't know how bad the pump leak is at this time.

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1987 300SDL 265,000 mi.
1982 300SD 325,000 mi. (and holding)
1956 Packard Clipper 150,000 mi.