.

Just do it mate


best option is to have complete donor car (if you go 617a way)
generation also has to match....
it is easy and it is fun

if you gonna 603/606 way you will have to play a bit with
instrument table/transmission/diff....
.

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w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded
next wish/project: w114 coupe OM603 powered