Unless you own or have access to a machine shop and want to make a career of this swap, you should pass this one up. It might be possible if you had two complete cars, since you need everthing from the fuel pump forward. But you would still have a huge amount of fabricating to do for mounts, linkages, AC, fuel lines, etc. Why don't you just buy a nice 300TE?
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe