So you are running no thermostat?

Put it back in if you are.

White smoke if your arent confusing it with steam is burning coolant, which is likely the lower intake gaskets, something that goes 1 step further than just doing the upper intake gasket.

I would not keep driving the car if its overheating like this, as you will blow a headgasket or the motor itself. Its really really hard to kill one of these, so don't do it.