This got me thinking to. The 4.250 crank will work in the stock BBC but can you put sleeves in and bore it to 4.500 or 4.600? Is it possible to build a 540ci(4.250 crank/4.500 bore) or 565ci.(4.250 crank/4.600 bore) engine with a stock block?
Ya I know it'll probably cost more than a Dart block but lets not think about the money side of it for now.