Don't know if a DOHC engine will fit-they won't fit some of the SOHC chassis cars. Maybe a 5.6L from a 560SEL or 560SL? But the problem with used engines from Pick N Pull type venues is unknown condition. Most were driven until they won't go any more or could not be repaired. Maybe buy a used car with the engine you want and take the carcass to the dismantler. Do you want to deal with adapting another FI system or stay with the D-jet that was originally in your car? You really need a complete car to get all the pieces. Did they cut the wiring harness?

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT