What caused this damage

Hi again, i have not done anything yet because of time butt i have bought another 440 that i will use the block from, what rods should i go with, dont need the top of the line but not the worst either, what brand of these will do the job, 440source scat eagle or is there any other brand in the same price range, stock length and 0.99 pin i assume? And how about ross pistons?

/Petri