340 block Vin #

From my understanding the B (Hamtramck) in that location would match the vin of the car. The B has nothing to do with where the motor was built nor does it mean Mound Road.
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I Know that My Vin Has B for Hamtramck. My Block Sequence # Is JM =J 73 M mound Road !! Also in your Pic They Don't have the P after the 340