Another thing that nobody brought up that might be a problem. You have 2 pistons that have broken ring lands, broken ring lands are caused by detnation. It would be surprising that only 2 pistons were affected. Without a magnaflux crack check your other pistons also could be junk. And on the overbore to .070 over? Your money but I wouldn't do it. Sell your good block for enough money to buy a rebuilt 440.