another thing to remember with this particular setup, i moved the radiator to the front of the core support because it is a huge crossflow unit, and there is a bunch of room that is unused from the backside of the grille to the front side of the support. the removable support like Andy showed on his coronet will work perfectly for radiator R&R, as well as any future engine work if needed.
as to the numbers on the top portion of the support, they are stamped in an area that is well away from any area that will be cut.
also, the top side is pretty flexible as is. i would like to stiffen that up some if possible.