We probably rarely will have flushes here and I don't see how we can have sets here.
I think you can defend this river by calling without bluff raising (but if you ever want to bluff raise, I'd say best hands are smth like 8Kh, 8Qh). I think Q favors your range more than his, so when he leads on a Q-turn, he cannot expect 2-streets of value from your 8x and worser hands. I would expect him having a lot of Jx and Tx w/o a pair in this spot. And I don't think we can call much of our gutshots on turn. I believe we can raise turn for value with strong Qx from our x-back range. I find that people rarely bet-3bet in this spot, they rather call with their draws or sd-hands.
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I don't think the Qx is a great card for our range given we remove most JT/QJ/QT, Qh combos from our range when we xb flop. I think our river raising range should only be comprised of flushes and flush-blockers. I would use some 8h combos for bluffs, stuff like Kh8x and even some AhTx type combos to balance our Axhh, 8xhh value-raises - be mindful to keep your frequencies in check though!