As was said, it kinda depends on what you find while it's apart. I went through and overhauled my wife's Triumph engine when we got it, and ended up only needing to replace the piston rings, crank bearings, timing chain, and gaskets. We had to turn the crank, but everything else still looked good.
If you're going to take the block apart anyway, that'd pretty much be the minimum I would do, although having the crank turned may not be necessary (and I wouldn't do it if it's still mirror shiny and good).
Here's the before and after on the engine:
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