Your head gaskets are blown. sorry to be the barrer of bad news.
Blown head gaskets.
The head gaskets must be replaced. This is a major repair that should only be undertaken by a professional.
Remove the head, Grind it flat and replace it using a new gasket.
YES. The intake gaskets have NOTHING to do with the head gaskets. It is a very common problem that the intake gaskets blow. It is not common for the head gaskets to leak unless the engine was over heated, and I mean HOT.
The fix is to remove both heads, have them inspected at a machine shop for cracks, or warpage, and install 2 new head gaskets.
It will solve the problem. The 3.4 is notorious for poor head gaskets. You can replace the gaskets on the engine without replacing the engine, and that will solve the problem for quite a while. It will be much less costly than an engine replacement.
water in the engine oil or a large amount of water in the exhaust also a compression test
Cracked cylinder head, blown head gasket, engine block or intake gaskets.
You can't. The heads must be removed in order to replace the head gaskets. No other way to do this.
WATER. This indicates a blown head gasket. Damage has been done to the engine in the form of overheating and the head gasket(s) have blown. Water therefor has leaked into the oil. Replacing the head gaskets is the way to repair this motor.