[DarknessofDeath]

seems like your headgasket is gone. i had the same problem pretty much from what you have wrote.
i didn't have the white smoke, coolant in the engine oil.but the main thing was a lot of pressure in the radiator causing the coolant to leak out of the coolant cap.
and the temperature going all over the place.

in the end. i swapped in a jdm engine because it was going to cost the same as changing the headgaskets. i'm in canada too, ontario actually. and my find for an engine was hard. was only one in the city. my search did come up with one in montreal i believe...but honestly. you would be better getting an engine from the states since it's much cheaper than up here for us canadian guys.