sbc 350 stamped ID numbers. What do I have?

Joenorris

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sbc 350
I know I have a sbc 350. Just got it cleaned and bored to .060 over because there was a lot of rust in cylinder 1 but now good as new. I would like to know what year this block was casted and possibly what it was originally in. The 2 stamped numbers at the front top passenger side flat spot next to the head says 16k471258 and V0712CMJ. The casting number on the back driver side is kind of hard to read but looks like 3970010. Can someone help me with this please?
 
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