I've decided to build a 340 for my Cuda and was wondering if there's a particular casting number I should be looking for or avoiding? I plan on doing a slight over bore, decking the heads etc, so I'm not too worried about low compression, but if there are high nickel, better water jackets, better main bearing bolts, I'd like to keep on the lookout for one. Since I'm in Puerto Rico, shipping can be a royal pain, otherwise I'd probably just go with a crate and stick a 6 pack on top.