When you say "c/r is his only move" do you just mean he will never lead here, or do you expect a large portion of his range to c/c this flop? Also, how aggressive is our villain?

My best guess from the op is that he is c/r'ing a fair amount in which case i would prefer to raise this flop. I don't like calling as much because I do not think we can really get away here on later streets and I would prefer to get it in when his stack off range is widest and before the board gets scarier.

Then again i haven't played poker in a while.