i think this is his range on the turn:

Board: 8s Tc 6h 4d
Dead:

equity win tie pots won pots tied
Hand 0: 40.909% 40.91% 00.00% 270 0.00 { AcAs }
Hand 1: 59.091% 59.09% 00.00% 390 0.00 { JJ-TT, 88, 66 }

against which you need a price of 3:2 or better to call his shove, which you do have. i think this guy 3bets queens preflop, but even if it is still in his preflop and flop smooth calling range, that just makes our equity better.

not sure if JJ would prefer to raise the flop to get you to define your hand than to call 3 barrels with an overpair, so maybe that can be discounted.