I believe the steering has to to be swapped out for the ford rack to work. There have been some conversions done by people.
look at this thread it may help..
1979 280CE with 383 stroker motor
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.