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I took a weld cutter and cut four holes surrounding the bolt hole in the floor and then using a C clamp held the plate it in place, then welded the plate in by welding the holes up it appears secure, i wasn't sure but you couldnt pry the thing off.
My 69 roadrunner and my son n laws 70 charger were length wise. The long way level with the floor. (Pic one), I apologize I didnt pay any attention to your pics lol.
picture one & as suggested best way is drill 4 holes in the floor about 1/2 inch in from the bracket edge on each corner then get someone to hold it or clamp it from the outside and weld 4 spot welds from the inside floor as the bracket strength is the floor pan not the weld