I bought a TB gasket when I replaced my TB, but didn't need it. From what I have heard, most people don't.
Have you gotten a TB coolant bypass kit? Not much to it, but maybe worth doing while you have everything else apart.
One other thing to consider. If you think you may want to play around with your own tuning sometime down the road, maybe getting WB O2 bung(s) welded on the headers may be worth while.
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