As kmind said, you should always look for extra reads to help in spots like this.

This villain is clearly very passive, and calls with a lot of hands pre-flop. In position I'd expect a lot of pocket pairs, broadways, Ax and some suited connectors. No idea what his 3bet range is, but I'd guess its pretty small, so there's probably not much you can discount other than AA, KK.

Post-flop, this guy is super-passive. He raises like never, so here there's a huge chance he has 22, 88, A8, 87, 98. Thats a very small portion of his preflop calling range, I know, but his flop action really narrows it down. Unless you have some sort of read that he would do this with a 2 or overcards, you're often not good here.