Photo 1 shows the modified original brake pedal all finished along with the 1980 piece in a better position to show the pushrod pin locations for reference.
Photo 2 shows a closer view of the above description.
Photo 3 shows after drilling the necessary 2 inch hole as measured from the 1980 floor section as seen earlier in my journal, and after assembling the clutch pushrod to the pedal and putting the entire assembly into the Suburban with a little more difficulty than removing the old one- as I now had the clutch pushrod and wider bracket to fit through the same space the old one was removed from.