SOmeone saif that doing a valve job on an old engine is a
gamble,becasue the increased compression will put increased stress on
lower end parts.

I am replacing the head gasket on a 3.9 dodge with 151,000 on it. I am
debating with having a valve job done or not. I will have it crack
checked and milled if necessary.

Or I thought about just laping the valves at home. I put fluid in one
of the heads and it seeped out slowly of every valve but one.