Here is the setup I came up with to connect a motorcraft 2 barrel to the stock throttle setup. I used a 1 inch phenolic adapter plate to adapt the 2 barrel to the 4 barrel Offy manifold
I tapped a hole in the spacer for the nylon pulley and made a nice ball pivot on the throttle arm, super polished and treated with titanium disulphide for friction free movement. Just pulling down on the cable activates the throttle.
I make no promises :-)