OK the "red wire" is the tensioner bar to the alternator and is not supposed to be red, the radiator has an oil cooler on the rhs (as you look at the pic) which is indicative of a 1973 350sl euro engine the M116 rather than the US M117 engine but the oil cap is right for a 1973.

come on Chuck give us the 3 deliberate mistakes

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61 Austin mini
67 Lotus 7
74 450sl
76 Cadillac 8.2l (501 ci)

some new cars

megasquirt conversion on:
djet 74 450sl http://www.mercdjetmegasquirt.britautorepair.com/
cis 76 450sl http://www.merccismegasquirt.britautorepair.com/

the best view is always from the point of no return