I've never heard of a 372 perkins engine, much less one in a 760, although there may be one.  We do have a 760 and an 860.  both are the 354 perkins. The 860's engine has a bigger turbo and some other improvements.  its called a 354.4 i believe.  either combine could have the 540 V-8 also.  if the combine had the v-8, it had a larger fuel tank also.  I know a guy who has a  v-8 in a 760.  the main difference between the 750_760 and the newer 850_860 is the straw walker length. there were also several improvements in radiator size_location, grain heads, and transmission_hydrostat shift linkage, etc over the years.