The 5.0 liter engine is the same on all of the years, I think, except the last year or two of the R129 model run, where they switched to the newer engine that the E-classes use that have three valves per cylinder and two spark plugs.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".