I used to be a 185-pound wrestler. Then I lifted and got to 220. What I found, though, was that because my legs and back could push so much more weight more explosively, it made me quicker, where I'd expected the reverse. So don't worry about becoming slower if you get big - once your body can lift substantially more than your own bodyweight, you'll find that you are much quicker.
As far as lean - more muscle mass means an upped metabolism. Something to keep in mind.
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