76 280 SL euro

I have a 1976 280 euro SL. It has electronic fuel injection. I have not been able to fined information on this fuel injection system. I bought this car with the timing chain out and had to grind the valves. (2 bent valves). I have had to adjust to run with vacume guage and tach.It is running fairly well now but still not perfect. I had trouble with the plugs heating up to start with and am afraid to drive it on any long trips untill I can get this system set up to specs. Is there a sorce for a manual on this fuel system? Or do you have specs on this system. Any help would be greatly appreciated. Boyd