Good spot to raise the river?

[iceman5]

I dont think there are all that many people who bluff raise the river. I know when I get raised on the river, if I dont have a disguised monster, I usually dont have the winner.

$5/$10NL

I open raise on the button to $40. BB calls. We both have $1000.

Pot is $85. The flop comes 732 rainbow. He checks, I bet $75 and he calls.

Pot $235. Turn is another 7. Check / check
Pot still $235. River is a Q. He bets $65 and I raise to $225.

Thoughts? I realize I didnt tell you what I have, but I wonder if it really matters. The only reason it matters is to determine if I want a call or not. I guess the question is what percentage of the time do you think the villian calls this raise?