Versus an unknown with no solid reads, you can err on the side of not being exploited here. He's risking around 67 BB's on the river for a 82bb pot, so you need to continue with around 55% of your range (1 - 67/(67+82)).

So just think of all the hands that you might play like this, and how many combos there are:
33 (3)
99 (3)
KK (3)
AhK (3)
AAh (3)
AhQ (3)
AhJ (3)
Axhh (8)
Qxhh (8)
Jxhh (8)
Txhh (2)
8xhh (2)

So a total of 49 combos will play like this. You need to call on the river with the top 55% (so top 27 combos).

That would definitely include most flushes, including Jxhh, since you get to the river with so many hands that aren't flushes (combo draws + sets).