Many people call a standard steel rule, a straight edge. They are not laterally stiff enough to be a straight edge and any lateral flex or a slight tilt will introduce errors.
However if the machinist is doing this kind of work all of the time, he should have a proper straight edge.
Like Rick said in an earlier post, well seasoned cast iron is fairly stable, on the other hand fabricated steel is not. If the block has distorted, I would expect the mains would need to be line-bored as well as surfacing the deck. Also check that the bores are within spec for circularity, etc.
Good luck.


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Sorry Serg, really shouldn't kick a man when he is down... but it was worth the chuckle (for me) 
.....had to stick it in a Datsun but

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