I came across a hemi block casting number 2468330-M, with a casting date of 5A26. It had a H 474 on the front pad, no VIN on the lower pad. and I noticed a "P" and a "T" stamped near the upper pad but not on it can anyone give me more info on the block year? What the casting numbers mean? Any other info? Possible WIW (I know wrong section)....