Villain has 3.5x opened from ep, surely this narrows his range to one that doesn't we don't play well against, and a range he will find hard to fold, if he had opened smaller or been in lp then his range would make jamming a good move but I think I find a fold with aj here
In a tournie think I will prob fold this. I find that when people do 3-5x it late on, they aren't planning on folding. They either have a pp (TT-KK) and annoyed 'idiots always call with Ace rag and get there', or they AK and are scared of getting hooded and not flopping a pair. If you have no real reads on villain I lean towards a fold, just wouldn't tell anyone about it.
If it's a cash game, I would jam it in then either top up 100bb or move down stakes.