I haven't worked on a straight six mercedes but have put megasquirt on a couple of cars and bikes. If you want a good looking installation and dont want to drill the head or manifold for multipoint injection then buy a shot carb and gut it and install the throttle body injector inside the carb. the TBI injector is quite small and will fit where the butterfly valve used to sit in a downdraught. in a side draught it will fit in the vacuum pot. its actually really easy to do and once the air filter is back on no one would even know you have injection other than 2 wires coming out of the carb.
megasquirt works well is cheap to build and allows you to do a lot of tuning
cheers
barri
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