The 350 SLC was never sold in the U.S. The SLC models sold here were
the 4.5-liter 450 SLC (in the 1972-1980 model years) and the 3.8-liter
380 SLC in the 1981 model year. The 350 SLC had a 3.5-liter V8 and was
available in the 1972-1979 model years in Europe and elsewhere but not
in the U.S. In the U.S., the 1972 450 SLC was called 350 SLC, but it
really was a 450 SLC with a 4.5-liter V8 that was simply mislabeled on
purpose by MB.