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Not to piss on your parade, but:
What you really want is one that says 010/020 underneath the timing cover and on the back of the engine where the bellhousing goes. Those are the most desirable of the factory gen 1 blocks.
It is my understanding (though I could be wrong, wouldn't be the first time) that the casting number on the back (39700010) "doesn't an 010 block make". The 010 you want is under the timing cover and bellhousing area, not in the main casting number. If it was the casting number (397xxx) that denoted high nickel then it wouldn't be anything special- thousands of those things were made.
They are also not all 4 bolt main. Many are 2 bolt main. I've owned an example of each.
If you want to have some more fun, see if you can get the engine suffix code off of the block deck. That will tell you what the engine originally came out of.
If you have an 010/020 block then you are in good shape as far as factory blocks go.
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