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My 0.02, the chain may be OK but the top guides are old and really should be replaced. Also, I'd replace the tensioner, which is an external to the engine job requiring (maybe) moving the spritzer bottle and alternator and removing the RH valve cover (which you have to do anyway to get to the guide and tensioner arm's plastic). I think that they leak and lose their internal spring tension when they get old. Not a cheap part ($60-100$), but look at it as insurance against a $4000 potential loss.
Other inexpensive plastic parts that can cause expensive problems when old: oil tube fittings. Get an oil tube fitting kit (see other posts about this - easy to install, a little less so to install CORRECTLY). They aren't more than maybe $8 a side. The PO of my 380 neglected these, causing oil starvation to a cam, which ate both it and all of its cam followers. If you are in there anyway to install the guides it takes maybe 10 minutes a side to do.
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