im guessing you cracked a stock block?? when we first built our 496ci 440-1c, 14.5-1, .750 ish cam, ect engine we cracked a cylinder the first season. At that time there were not many choices of blocks so i did another stock block but i filled it with cement and added a girdle. The engine ran another 4 HARD seasons with not problems.

You are lucky cause u have a few choices. The choice I would make is a Koleno block! Give Scott Koffle a call. Also Big Bear will chime in im sure. They have a great block and all your worries will disspapear.