Yes, you will need to have the rear end narrowed to get that type backspacing on a wheel like that. You will also need to mini-tub it as an 11" wheel will run a 315 tire.
I don't recall the difference between the rotor hat thickness and the drum when I did that conversion. I seem to recall it was an extra .100" or there abouts. Of course, different rotors will have different thicknesses in the hat.
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