As the owner, and lover, of a full custom Gunnar, congratulations on your purchase!

Road bikes with drop bars do have a different riding position than flat bars, so you will likely need to focus on your body position and your core. I tried to move from flat bars to road bars, but didn't like it so all of my bikes have riser bars of some kind or another. Others here with more experience with road bars will better be able to advise, but congratulations!