I would assume it's coming out of the valve covers. Don't just keep trying to tighten them more and more as the threads in the head will strip out. That would make for a really, really bad day.
If it bothers you enough, you could go the cheap fix. Remove, carefully, the valve covers. Coat the gasket surfaces with a thin coating of Perm a Tex Form a Gasket number 2, non-hardening. Reassemble.
Or you could go the spendy route and get new gaskets.
Which ever way you go, do not over tighten the bolts.
As long as you are in there, check the valve lash. Your valves and cylinder head will thank you if hasn't been done for a while.
HTH, have fun..
Yeah, if you want true ram air tuning, you better be willing to ram some air! (SteveinSunnyFlorida)
'99 Concours(with 234,xxx miles on it), sold
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And most of Canada too, eh?