Thanks Everyone,
I did complete the valve adjust on the car. I was able to lift with hex wrench the rocker arms out of the way to get a 17mm socket on the stuck valve adjust screws... I kinda read the valve guide tour as one needs to compression the spring to lift the rocker out of the way..who knew it was that easy. O'well all is good with my 1970 280SL...once the rain clears...back on the road.
Mark