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"estimate" 30 minutes per pound. I don't cook by time - I cook by temp.
the lower the better, if smoking. 225 if you can. Pull with IT of 130-140. It will be red/pink, but a roast is much different than 130 in a ribeye steak.
S&P are excellent. No need to rub anything else, but you're more than welcome to use just about anything you'd like.