Sounds like someone has transplanted an OM603 engine from an '86 into an '83. The question is what body is the '83? Would be relatively easy on the 126 car, as it was made with both OM617 and OM603 engines during its production run.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC