[KTL]

This one is a tough call if you're on a tight budget. I say that because you may think you're arresting your problem of oil consumption (if that is indeed an issue) with valve guides. Then you button it all back up and your engine still consumes some noticeable oil. Darn, should have re-ringed it/reconditioned pistons and cylinders.

So while you're at it, you look at the P's & C's and some are out of spec. Now you have to get some replacement P's & C's. Best to take a look at them now while you have it all apart that far. However if you're an avid/frequent DIY'er, you could leave well enough alone and tear it down again some other time. All depends on how much you're willing to tackle.

Regarding intermediate shaft bearing wear, they start to show copper quite soon after new replacement. They just do, due to the load placed on the sprockets by the chains. However it's not a terminal failure issue waiting to happen because they all seem to do it w/out causing a bad failure if left unattended to.