You should get in contact with a shipper that specializes in cars. From my little bit of research I the past, it seems you won't have to do anything if the car is 25+ years old.

All gasoline cars post 1978 have catalytic converters. Differences on the m103 as far as I know:

1- no ezl ece adjustable timing knob for better or crappy gas.
2- compression is lower on us engines.
3- cat converter (lack of on euro) as well as o2 sensor.

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2