I'm kind of a nit deep.

If we assume that he wasn't slow playing on the flop this deep (ie: doesn't have 55/66, maaaybe has TT), and we block some of the hands this turn would improve (we block 67/57) then his range is probably polarized to bluffs and to 89 and some 34 (much less likely).

I would probably call/call any non pairing river, and c/bomb pairing river.