only thing is if you got for a 200 block - unless its cheap, you will need new pistons,rings and crank shells if its been bored out etc,

- can u see where it is blowing , i bet at the gap where the end of one ring buits up against the edge of the back of the next ring, they cause high stress where thaey clamp and cause the gasget to be stretched over it - almost crimping the gasket around the top of the bores causing a weaker seal than justa good normal setup.