Where is the VIN stamped on a '70 340 block?

fordch said
I have an AAR or TA block the only stamped number I can find is FW340P31700375 there is a small s between a little below the line. Would this be considered the engine VIN?

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No, look at the picture I posted of the 440 for the location of your vin.

Your pic is the assembly production sequence numbers