| Wow, I read the title and was about to auto-post callcallcallcall but looking at this I am stumped.
Its marginal whether you call or fold. I could definately see him flatting KQ/55/AdXd preflop. I think he only calls the river with KJ/AK, so his shove is the Nut flush/Boat or pure air. But if it was the A high flush I can't see him check calling turn and checking to you on the river.
I call cos I don't think many players at 200nl check a boat or a flush on the river even to a "maniac". Its also likely he would expect you to call a raise if he put one in on the turn. | 
