You can have the rad. checked at any Rad. shop Or even some parts stores can check to see if your getting gasses in the water. But is sounds more like you have other issues if your mixing water in the oil.
Like said cracked block or Head, Gasket, Or a warped head Or block deck no lonnger true.
DID you use any sealer On the Head Bolts??? If not this to can be your porblem.The water will go up the head bolt Into the valve cover area and then down into the oil pan.
God doesn't like ugly.
