I say raise givin the info you provided with the hand and player involved. He is very unlikely to be full; the 8's are dead and he would've raised on 3rd with trips. There is a good chance he has a flush also, but probably not AK. Anything lower you have dominated, plus you still have the one card (K) royal draw for back up if he does have the K. The odds are with you to make it 2 to go on 6th.