Blinds 800/1600 ante 200
8 handed.

Villain (124,500 in Mid position)- raises to 3500
Hero [As,Kc] (51,500 in Cutoff)- 3b to 8100
Vllain flat.
Flop Tc8s3d
Villain checks, Hero?

Villain is recreational player who has some understanding of the game but seems to have the attitude that if he thinks he has the best hand, he will shove here. He seems to flat a decent amount of 3bets and sometimes 4bets, but has a relatively tight opening range. What should I be doing with my range, which includes JJ-AA, AK and some hands like A5s A4s A3s?