my 603 is a relativity small Sized engine (length width wise) one of the similar engine should work. you would need the wiring harness, the computer and all the other bits you would need to make it work. I've read you may have to beef up the front end a little to support the extra weight of the motor, but I dont know the weights of them so I cant put anything more in on that. if you do it, take lots of pictures though. I'd be interested in seeing it

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed