Cold Case radiator # mop 755k

timing? air fuel ratio?
I have adjusted my timing until I am blue in the face every way shape or form plugs are running a nice saddle tan and even in color I am running a 650 CFM AVS Edelbrock I do not have an air fuel ratio meter in the car she does want to diesel once she hits 210 and I try to shut her down I have tried running the vacuum advance seems to make the car ping worse then when I do not run the advance I have tried both ports on the carburetor doesn't seem to make much of a difference