Crank end play, destroyed converter, 408 nightmare

I asked on the head gasket because of the finer surface finish that should be used on heads and block with the Cometics. Just be aware of that.

That thickness increase ought to get the SCR down about 0.8 or 0.9 points. But any quench effect you had will be lost; the dimensions are not given to know how much quench gap there was.