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This is a Magnum block. Note the 3 cast in lugs around the center core plug- those are the bosses for the Magnum engine (truck) mount brackets, and are not present on any LAs. That said, there's not much difference in the LA 360and early Magnum 5.9 blocks- the magnum timing cover will physically fit an LA; but FYI you must also use the magnum reverse rotation water pump and serpentine drive with that cover. For standard rotation use an LA cover and pump, even on a Magnum.
To the Mods: Sorry for comments and discussion in a "Wanted" thread- just trying to clarify things. Any further discussion will be via PM.