Yeah I don't think he has too many of those combo's in his range given that he called out of position preflop.

What is interesting though is even if we just add 98s to his range, our equity improves a decent amount:

quity win tie pots won pots tied
Hand 0: 61.551% 61.55% 00.00% 12187 0.00 { QQ, 99-88, 33, JdTd, 98s, 7d6d }
Hand 1: 38.449% 38.45% 00.00% 7613 0.00 { AcAh }

So I guess it really comes down to how wide he's calling preflop. Since I haven't seen him showdown any of these hands in such a scenerio (I'd have a note if he did) I'm not sure we can assume he has them or not :/

If we assume he never does this with QQ as the overpair combos, then our equity is 17%...so depending on how much air he has in his range, I suppose we could bet/call the flop and re-evaluate the turn since we'll have appropriate pot odds to call his flop c/r?