Check your coolant level. And check a plug to see if it's wet. I know that sounds seriously screwy. Your a GT with a plastic upper intake known to crack and put coolant into the engine. If you are seeing heavy white smoke and it's not condensation, it's likely coolant from your upper manifold.

Check asap, because after a little smoke and the engine not running (wet plugs don't toss a spark) next up is hydrolock and thats a bad thing for bearings.