The front plate is S&W part number 20-204 and should fit all 460's as far as I know. Typically you would not use motor mounts if you were going to a plate or vise-versa. Motor plates would be for chassis stiffening, header clearance, engine swapping ease (if motor mounts do not exist for a 460), or to absolutely eliminate engine torsional movement within the chassis. If using a trans brake or in a hard leaving car some type of fore and aft movement limiters would be required too, I would do it reguardless. Switching to a motor plate isnt always the right choice depending on what you are planning to do in the future with the car.
