White smoke. Someone help!!!

[MrMK3-707]

Ok i just replaced the head gasket on my 7MGE. Got it all back together and then it ended up not starting. It stopped starting before i changed the head gasket. So i tried a bunch of things and i still couldnt get it to sart. I Ended up taking it in to the shop and had them check it and they said the mass air flow sensor had an internal short in it and wasnt producing the 5 volts to let the car start. So i went out to pick n pull and got some parts for it (including the sensor) and the car started right up.

Now while the car is running all i get is white smoke. I dont know what i did wrong so can someone give me some ideas.
Also, would adding too much oil have anything to do with it?

Thanks,