I'm never folding a riv blank after playing the hand this way vs this sort of opponent. If he is going to go insane with 3bs pre, then I'm going to make him show me a hand when I decide to defend oop and flop a pair. We don't know how retarded he is (dumb spot to bluff on blank riv bc so many draws missed and you are repping a hand with sd value) and you will be getting a good price on a call. develop a read further from there.

As the hand was played out, I would def instacheck the riv, just to make your hand look as weak as possible. Someone said it earlier, what bluffs do you have in your range? and given how wide he is 3betting, how many real hands does he have here? a hand you are looking to get called by is even less likely because he is unlikely to cbet and double barrel hands like 22-99 and 8x.