I know a Dart dealer up here. He sells big and little M blocks that are blems for $1300/$1600 last i checked which was a few yrs ago.Maybe more now. Once they get some blems of the new Mopar blocks i'm sure he will have some. I'm thinking about building another SB in the future with w8's or even the new Edelbrock's.

http://www.youtube.com/watch?v=aIxaesJ190U

http://youtu.be/lCZAaN7fFLg