Bad C69A block

[Lawrie]

I'm going to see if I can sleave this bad bore ,A question for the rebuilders here, when I put the step in the bottom of the bore to stop the liner against, how far up from the bottom should it be,I measured to the bottom of the water jacket on the inside by the bottom of the bore ,should I go a bit below that area, it looks like its only about 1/4 thick there through to the inside of the crankcase area.
Thanks Lawrie.