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There are two coolant-manifold gaskets (item #2 on the picture) where the two coolant pipes connect to, these also become fray/dis-integrate over time, I'd replace those as well.
As for WP/thermostat, I'd replace them if I were you, not bad in terms of cost but you have to remove them to get to valley-pan, unless you like to wrestle with those two pipes next time around (they are hard to get and put back into, I had pinched the o-rings and had leaks).
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