M130 engines come in both fuel injected and carbureted versions (unlike, it seems, almost every other MB engine which has a different major engine numbers for the injected vs. carbureted). The injected versions will not fit unless you are willing to do major cab and bell housing modifications (due to the injector pump hanging off the side of the engine).
An incomplete, non-exhaustive, quite possibly wrong in horrible ways, list of M130 engine configurations:
M130.920 - carbureted, 9.0:1, 120-140hp, 68-72 280S
M130.921 - carbureted, 8.7:1, 125hp, 250C?
M130.923 - carbureted, 9.5:1, 110-130hp, 70-76 250, 69-76 250C?
M130.925 - carbureted, 7.8:1, 110hp, unimog 404.0
M130.933 - carbureted? 8.7:2, 118hp, 68-72 250?
M130.980 - injected, 9.5:1, 160hp, 67-71 280SE, 68-71 280SEL
M130.981 - injected, 9.5:1, 170hp, 68-70 300SEL
M130.983 - injected?, 9.5:1, 170hp, 68-71 280SL
M130.984 - injected?, 8.7:1, 140hp, 68-72 280SE/280SEC/280SL
