If the engine is out, I'd @ the VERY get the engine on a stand, drop the lower pan and pull a main and rod bearing or two.. Depending on how the engine has been treated you may be surprised by what you find.. If the bearings are showing signs now is the time! A new oil pump is likely un-neccesary, but it does buy piece of mind.
Unless the bearings are Toast and the journals a mess installing a set of standards isn't going to be a big deal. If you use plastigauge properly you can get accurate results, just so many people screw it up when doing so.
Clean, clean, clean and assemble with thought and care. 3X check your torque, mark each fastener when completed. You'll be spot on just as the factory was.
If the engine needs time-serting, I have the jig and tools required.
Jonathan
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