W123 gas to diesel conversion questions
 

I have a 1979 280E with a questionable motor, and I would like to swap the motor out for one that I can run on biodiesel. Does anyone know if an engine from a 240D
or 300D would bolt up to the transmission in the 280E? I found someone who will sell me a 240D motor for $200 with all of the wiring, engine mounts, etc. but not the
rest of the drivetrain. If it will bolt up what additional parts would I need? I figure I could use the existing gas tank, as it already has a return line and just clean it out
well and replace the fillter tube. Thanks!