Aces in 3 bet pot against a nit - Line Check

[cooker3]

I have been running at 20/20/2 over abouty 50 hands.
Villain is this hand is e306 who is a big nit. His stats are 17/8/2 over 20,000 hands. I have played lots with him and just run over him, if he ever plays back I drop all bar nuts like a hot potato.
I feel his range to call a 3 bet oop is very tight, possibly AK,QQ+ so do we like?

Green Joker Poker 0.50/1.00, hand converted by the iPoker Converter at Talking-Poker

saw flop | <font color="#C00000">saw showdown</font>

Button <font color="#C00000">Hero($102.00)</font>
SB ($71.65)
BB ($154.00)
UTG <font color="#C00000">UTG ($211.79)</font>
UTG+1 ($323.68)

Preflop: , UTG raises to 4.00, 1 fold, Hero raises to 12.00, 2 folds, UTG calls 8.00.

Flop (25.50) 7 [img]/images/graemlins/club.gif[/img] 4 [img]/images/graemlins/diamond.gif[/img] K [img]/images/graemlins/diamond.gif[/img]
UTG checks, Hero checks.

Turn (25.50) 6 [img]/images/graemlins/heart.gif[/img]
UTG bets 18.00, Hero calls 18.00.

River (61.50) 4 [img]/images/graemlins/club.gif[/img]
UTG checks, Hero bets 40.00

If he c/r river I am insta folding btw