TP and nut flush draw

[iceman5]

$10/$20 NL 6 max. Im playing short of course.

The table is surprisingly passive. I limp [5c] UTG and its heads up with the BB.
Flop comes [8d][7c]. BB checks and I check it back.
Turn . He checks. I bet $35 and he calls.
River . He checks, I bet $65 and guy calls with 63. Gotta love it.

So a few hands later I limp [5d] again. This time UTG+1. I have $550
Next guy limps and both blinds play.
Pot $80. Flop [Jd][6d]. Blinds check, I bet $55. Cutoff calls (not same guy) and we're heads up.
Pot $190. Turn . Whats my play here? I have $475 left. Obviously I have the nut flush draw but is my ace also good? Not sure.

I think I have just about the correct stack size for a check raise all in to be good if he will bet middle pair if I check. He didnt raise the flop so I put him on something like QJ or possibly a weak suited ace himself.

[RedBarracuda]

[k3nt]

[kennyg]

[Twelver]

[iceman5]