Against an unknown I would often check the turn and get allin on the river. Against this guy I would happily stick the rest in on the turn though (you only little more than a ½potsized bet left) - if he's as loose as you say he will call with any 9, TT/JJ and possibly 88/77/66 and JT (straight draw) plus the pot is big enough to justify an allin even if he folds a decent amount of the time.