IIRC the valves are supposed to be adjusted every 60 or 90k.

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I hear its hell "adjusting" valves on a 3.0. You use shims instead of adjusters. This is coming from a 20+ year lead tech at Toyota.
It is, you have to have the right shim, so you need to buy several different sizes(which gets pricey) so you don't have to keep running back to the dealer. I do all of my own service, except the valve adjustment, some headaches are easier when you pay others to do the work.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed