400 Block...what to look for?

Get her disassembled then get the stripped block (all the plugs) hot tanked and crack tested before spending any more money, she should be good. Then while she's in the shop get the mains alignment checked along with the lifter bores and then bush the lifter bores, cuss you know you really want to go roller cam. Don't forget to have the deck trued. Now shop around for a forged 440 crank and the rods and pistons to stroke this puppy to 451 or just get a hold of, lets say, 440 source or Hughes and buy everything from them. I'll be go to hell. This all looks familiar, I remember now, this is what I'm doing.=P~

http://www.arengineering.com/articles/451.html

The last 3 casting numbers being 230 mean that's the block with the thicker main saddles. There's a article kicking around that talks specifics just can't find it.