Marine 360?

Crank oil seal serrations opposite angle on a reverse. Image is a sb reverse from eba......
View attachment 1715567329


I believe a block is a block. Curious, does it have "LM" stamped on it by chance?

Free manual download if it helps for the LM318-LM360.........
Engine Data And Specifications - Chrysler LM 318 Service Manual [Page 8] | ManualsLib
Thanks for that info, it's just a bare block and the only ID I can find on it is '18970' stamped on the front of it.