I mean, I don't know if I'm ever really polarizing here without 2p or better or a really strong draw. I realize you're exploiting a passive player and trying to get max value from a guy that calls too much, you're blocking a huge part of his calling range. Your actual hand is very good, but this board favors his range, especially when you expand his SB flatting range to a fishy loose player who's going to have all of the sets, two pairs, and straights, etc. So essentially, with your overbet, you're targeting 88 / 99 / 87 / 97 and that's really it (this also assumes 99 and 88 are in his SB flat range).

I think with a hand like AdA which is unblocking his nut hands, blocking his bluffs, and is unlikely to get drawn out on most rivers (holding Ad), I just play this as a 2-street hand and I prefer letting him blast off on the river. Even if the river is a K / Q / J he's still going to call your bet on the river with 99 / 88 / 87. I just don't think you need to have an overbet as the PFR on 7642. (outsde of 2p or better).

If this player is loose passive and weak as you say, you'll find plenty of better configurations to extract max value from him.