Why not find a european spec 4.5 motor? Would probably be much easier- no feedback system and such. 225hp stock, and you won't even have to change your trunk badge.
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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.
Had a:
1973 220 (gas)
1980 300SD
1992 400E
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