FOUND 340 MOTORS
# 5/3/70; OB388829
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0B 388829 is from a 1970 Challenger with a 340, so there are only two possible VINs that would match the block.
I will list them both here so they should show up if the car owner does a web search;
JH23H0B388829 or JH27H0B388829
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