I'd bet here every time.
Basically you know nothing about him, so what to do, and more importantly, why?
When he checks, he tells
you that he's afraid you've got the 8, or he has a monster and wants to keep you in the pot. The odds
of him having a monster are slim, but he could easily be checking for pot control with any OP or AK, so why bet? You've got a made hand, charge him if he wants to peel one off with AQ kinda hands and at the same time you keep him worried about you having an 8. Should he call your bet, he'll most likely check the river also, in which case you can check behind safely. If he bets the river kinda weak, you could also keep repping the 8, by putting in a raise, that is not adviceable however, as you don't know if he can lay a hand down.