I agree with Beavis. I'm going to bet large. I figure that he'll call with AK/KQ, and probably re-raise with a set.

If I bet the pot and he re-raises, I will probably fold, since I can't see a "very passive" player re-raising with anything other then a set there. If he calls I will assume he has top pair good kicker.

On the turn/river with a check in front of me I'll put out a teaser bet of about half the pot. If a high card comes and he leads out I'll be very cautious and may call or fold. If a low card/blank comes and he leads out, I'm going to put him on AK and re-raise all-in.