The first model 107's through '74 or '75, can't remember which, had Bosch D-Jetronics electronic fuel injection. Injectors are very expensive to and not exactly inexpensive to buy refurbished. The later K-Jetronics (CIS) is a mechanical system but it also has some expensive parts if they fail.
The 1986-89 560SL had the new subframe so you don't have to worry about that. Also ABS. A decent, low mileage can still be bought for a reasonable price. A higher mileage, well documented one is also a good buy, just make sure the timing chain, guides and tensioner have been replaced if near 100,000 miles or over.
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