all-in with flush draw?

My first tounament post - hello everyone [img]/images/graemlins/smile.gif[/img]

Heads up in a $10 limit table. Stakes are at 600-1200. I have 2500 in my stack and opponent has 5500. opponent has been aggressive with made hands and hasn't shown down any bluffs.
My hand Kd 8d, I raise and opponent calls.
Flop: 3d, 3c, 10d,. Opponent bets... (telling me he's more than likely got a 3 or 10), hero..?

I'm new to STT's and am wondering what a good strategy is here with this flush draw in this situation.