Slant 6 build date

interesting oil filter placement,,yellow color on block and the clutch fork is on the right side,, guessing it is either an early truck motor or from an industrial applicaton..

on the top deck of the block, just below #1 sparkplug there is a flat pad that extends out maybe a quarter inch and is maybe 2 inches long,, that is where the engine assembly plant stamped the build date, assembly plant ID,markers for us crank pins...