M cam vs 450 cam

What is the difference beside's the nut on the front the m being right hand thread and the 450 being Left hand thread? Is there more lift and duration with the 450 cam? How will that effect low end lug power? I am asking because I am building a 281 ci motor with steped piston's and a ported 8060 head. Running about 1600 RPM.
 

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