[Evan]

I think this line sucks on a J63 flop. It doesn't seem like you had any reason to believe he was going to fold a hand that he'd gaybet the flop with. He can't have a draw unless it's 54. I think if he's gayetting he's got something and most people don't fond something, especially if it's something worthy of taking away your initiative on the flop.

I think I'd rather call the flop because I would call the flop with all my really good hands (top pair+). If he bets the turn again I'm gone. I think he'll check the turn often enough with this line when you want him to considering it costs half as much.