Caterpillar 955L Engine Rebuild delema

I am hoping I can get some answers and I know that I have come to the right place. After several months working part time on my 955L, I finally have my 3304 PC engine apart. My biggest concern is cylinder #1 and the crank. In cylinder #1 there is a piece missing at the very bottom of the linear. The missing piece is about 1" long by about 1/4" high. The block is also broken in the same location. I can't tell if when they installed the linear they did this damage. Cylinder #1 is a true Caterpillar piston and liner and all the other pistons and linear's are IPC. I have attached a picture showing the liner and block. I am hoping to learn from this forum if I should be looking for a new engine block or if my engine block is fine once I install new linear's.

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