Wow, sick spot but I'd feel beat after he flats your 3bet on the flop but that is me just considering an average player without having a read.  I can see he re-raising your lead out very wide on a board like that considering it never hits you to try and represent he has a hand but usually i would think he would fold to a 3bet with a lot of his air here as it's getting expensive so I'm not sure I could continue as you put in 1/3rd of your chips already and will be pot committed betting again.  88, or JJ seem possible if he isn't the kind of guy to 3bet with hands like JJ, QQ, or even  KK or AA preflop their are some that don't at those stakes despite the fact this is a super deep tourney and you should be doing all you can to put more money in the pot with bigger pairs preflop.