Scott, I will guess you second pic is six pack too...what better way try to trick than show the same Is the S440 75 truck? (I have a 76 here that is T440)

I have only known that you check the vin to be sure of 6 pack, does anyone know about warranty blocks? Just the internals? If you needed a warranty block for a 6 pack, was it an HP block that you got?