there is nothing replacement/warranty about this block, this is an "In Plant" fix - P R O D U C T I O N

here's an engine & transmission from a Super Bee from Lynch Rd. 6 months earlier, the middle three numbers on the engine were "RE-STAMPED" with the same characters used for the VIN on the OP's engine scope

did the OP ever track down the matching Road Runner

moparts 0a141468-eng hemi_vin mod.jpg