Engine Cutting Out! What to check?

I finally chaned out the voltage regulator and that didn't seem to make a difference. Bad ground I guess? The other thing I am concerned about is that I am seeing a constant stream of white smoke coming from the valve cover breathers. Also when I revved up the motor, I looked out of the garage and noticed a cloud of white smoke billowing out. I am concerned I have a blow head gasket or something.