I need help please to identify my M151 - No identifying Mfg Data Plate on M151 -But identifier on engine

Unit looks like a M151A2 to me - But
This is my 1st ever Willy amd 1st ever Project Vehicle as well - Double Lost in this ?? Lol

1st it’s a Diesel ? - have not seen or knew that one
Unknown Code then Part# 8754411
DOD Contract #
DA-20-113-AMC-07506 (T) (MYP)
RPM Rated for 4000
Firing Order 1-3-4-2

Any help at all is fantastic whether it’s the year of Engine or Years and models these engine were install in the M151 series

Hard Body is but a solid single unit as well

I can not find a darn thing anywhere