the bearing tang notches are well inboard of the original width. i forsee no problems there, and its 1/8" material removed per side of each rod
To use it in your GMC application...yeah an 1/8" of each side. To use it in a 292 engine that I was answering samwise's question to, requires a 1/4" of material to be removed from each side, thats what im referencing, the stock 292 rods are just slightly over 1" wide, and to use the same rods as you mentioned will require that much more additionally to be removed.
