Interesting. 
 
Unless u have a read that he is an ubernit 
Id shove flop probably since there are quite a bunch of hands thet u beat which would reraise u when he isnt a nit 
 
like KJ   ,A8+ FD,  OESD, AJ , QQ , maybe even JT or any FD 
 
When u see him as a NIT  
a fold could be okay here since he wont 3 bet u flop unless he has a set or 2 pair. 
But you have to be sure that he never 3 bets with draws and that he calls with top pair 
 
Unless ure quite sure about that 
id suggest a shove pver his 3 bet here 
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