hi i have a 1955 190sl 4cyl car in for service,i need the ignition timing setting at idle,it is set at 20 btdc,also runs very rich,it has twin solex side draught carbys with looks like a 2nd stage ,my books only go back to 1969,i started on benz in 1970,but all my old contacts here have passed on,so if any one has some info i would apreaciate it thanks,