FiTech just released a smaller two barrel efi kit. Same as the kit I fitted but better choice for smaller Mercedes engine. Doing the conversion today I would go for this one - the 4 barrel, while can be made to work well, is too large for the engine size
http://fitechefi.com/products/39001/
W114 280 1974 light ivory
W108 280SE 3.5 1972 pine green metallic
R107 500SL 1984 champagne metallic