Don't overthink this thing too much!!
There are a couple of biggies, both around 1980 and later. Pencil style glow plugs and the R4 compressor on the lower left portion of engine as opposed to the giant York on the top right.
Remember, if 67hp is the question, 72hp ain't the answer.....

__________________
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John