420 SEL engine replacement

[Lebc888]

Hi,

I have a low millage 1987 420 SEL with an engine that have to be replaced.

Apart from another 1987 4.2 engine, what else can I instal in that car that would link with the original transmission?

Would a 420 engine from another year or a 560 engine fit well?

Can I install a turbo diesel engine in there and what else would I have to replace to make it work?

Thanks

Christian