Providing the rad will clear the sheetmetal of the grille, you would need to weld a pair of tangs underneath the front crossmember and add a support rod from the rad to the firewall. When I did mine I also changed the grille so I can't address whether or not a CJ3A grille will allow it to clear. The tangs, of course, must be aligned correctly as to spacing and angle. I acquired the tangs from a junker frame. There are notches in the tangs that have compound angles in order to fit under the crossmember which make it difficult to make one's own.
Larry
