450SL Ignition and Fuel Injection

On a 1979 450SL I see the ignition timing is TDC, but is the dwell angle adjustable. Vehicle has wheel and transistored (Federal) ignition.

In reading other shop forum articles, I noted an article stating that if the fuel injectors are steel body (which mine are) to replace them unconditionally with updated brass body. This was information on a 1983 500 family vehicle.

Thanks in advance this is a great resource, although I have the manuals understanding the information at times in a problem.